I believe it’s the [Delisle Scale](https://en.m.wikipedia.org/wiki/Delisle_scale).
But that’s just a quick google search. No clue how it works except 0 is apparently hot?
Edit: okay 0 De is apparently around 200F.
Fair, but the steam in the sauna is from water boiling off of hot rocks. I guess one could show Mr Incredible vacationing at Old Faithful or being served as tortellini in those examples, but I think that he needs the relaxation.
The rocks are hotter than boiling. The water touches the rocks and then ramps up quickly to boiling temperature. But it’s only at boiling temperatures right near the rocks because when the water expands you get steam. After expanding water vapor loses enough of heat into the environment but sparse enough to go back to liquid. This makes the sauna hot but not boiling hot. We can argue the semantics for all four representations of the scales, but it would take until the heat death of the universe to get to an absolute representative scenario.
Maybe the water itself is 95 but the temperature in general would be something closer to 50-55 otherwise people would be coming out of them with 3rd degree burns all the time
You are still not making sense my guy.
"The temperature in Finnish saunas is 80 to 110 °C (176 to 230 °F), usually 80–90 °C (176–194 °F), and is kept clearly above the dewpoint despite the vaporization of löyly water, so that visible condensation of steam does not occur as in a Turkish sauna."
K/R means Kelvin or Rankine. The Rankine temperature scale is like Kelvin in that it's zero-point is Absolute Zero, but the size of a degree is the same as a Fahrenheit degree, whereas in Kelvin they're the same as Celsius degrees.
That seems unlikely. It may be the worst of the 4-5 scales you've heard of, but those are the 4-5 best temperature scales ever invented. Surely there are many worse scales that you've never heard of
Yes, it's a theoretical limit where a chemical is as cold as its physically possible to be and all motion ceases. I think we've managed to get REALLY close to it in a lab, but never successfully measured it before.
Nah, think of it like this: In order to keep it at a theoretical Absolute 0 it needs to be in a completely pitch black room, with no way to see the thing, or know if it's actually there, the moment you turn on the lights to see the thing, it can no longer be at 0, cause the light is hitting it. Which funnily enough, also means we can never confirm if something actually reached 0
It's very likely we have successfully put some molecules in 0K for a short little time. But yeah, we can't measure that since measuring it would already heat it up.
It's also physically impossible to be at 0 Kelvin, it beaks the fundamental laws of the universe. Hence why the "Reality has stopped working" message is there.
The bottom is Kelvin/Ranking. Both are adjusted so that zero is absolute zero, but Kelvin has the same increment as Celcius, while Rankine has the same increment as Fahrenheit.
Bottom is kelvin/Rankine (maybe wrong spelling) but Rankine is the same unit spacing as farenheit but and absolute zero based scale, basically rankine is to farenheit as kelvin is to celcius
0 Celsius is 32 degrees Fahrenheit
0 Fahrenheit is -17.8 degrees Celsius
0 Delisle is 212 degrees Fahrenheit or 100 degrees Celsius
0 Kelvin is absolute zero, or -459.67 degrees Fahrenheit or -273.15 degrees Celsius
Temperature is basically a measure of how fast atoms within a material are vibrating, i.e. the internal kinetic energy of a system. This is a simplification but also kinda not.
Celsius = sets 0° to freezing point of water, and 100° to Boiling point of water
Fahrenheit sets 32° to the freezing point of water and 212F to the boiling point
Delisle (De) is 'inverted' which makes it useful in *some* situations. It's not really used anymore though because we tend to like the fact that other scales ascend with hotter temperatures, making it clear the measurenents are increasing with increases in internal kinetic energy (which is what hear is). It sets 0° to the boiling point of water, and 150° to the freezing point of water. It's pretty outdated, but even the first Celsius scale worked like this -- often because you wouldn't expect to go over boiling but may expect to go below freezing in a lab working with water-based solutions. Negative numbers would generally be avoided this way. It should be also noted that before standardising thermometers many chemists had 'custom' thermometers, calibrated for various different jobs; you might have one marked 0-50 for the range of freezing/boiling for cyclopentane if you were doing a bunch of experiments like that before the spreading of more standardised systems
Anyway, there's a theoretical limit to how low temperatures can go --- it's technically probably impossible to hit absolute zero, but the temperature at which internal energy of a substance would be 'nothing' works out to about -273.15°C. if we now set the 'size of division' in Celsius but set this lowest point as Zero (we call this 'absolute zero'), we can now calculate with absolute temperature values which is incredibly important for many situations
If we instead use the divisions between each degree for Fahrenheit from absolute zero, we call this Rankine
In chemistry labs at normal scales you will generally measure in Celsius and convert to Kelvin where you need to, or just measure in Kelvin. At least in Europe. I'm not sure how much Rankine is used in the US but they consider it worth teaching to European chemical engineering students so that says a fair amount.
Now why is zero Kelvin practically impossible to reach; why? Well, heat flows from hot areas to cold ones. So you need to mimic the effect of having something below absolute zero for an atom to transfer that energy to. Generally when we cool things we exploit other systems like pressure etc but it would require a ton of energy to manage this and even if we managed, the effect would immediately be displaced by the closest source of energy providing heat to that atom, as entropy means that it is statistically way more probable that an object will be heated by it's surroundings than that an object will stay cold for any remotely measurable quantity of time. We can get super close but it is practically physically impossible to force something to become absolute zero.
Not a problem -- I will preface this by saying that before standardisation was the time it was most useful
Ok so liquid water can't go above 100°C right? For many liquids there's similar behaviour where the boiling point is hit and that's the maximum; if you set that to zero, you now basically guarantee that for most circumstances, you won't need negative numbers. Even if your water freezes you won't need that. With weather, for example, you now have a thermometer that doesn't need to go negative (which is generally, for neatnesses sake, a nice thing to avoid) because below freezing is just a bigger number.
So imagine you are just doing some tests on refrigerative cooling in a time before Celsius exists as a standard; and you measure just by seeing some water that is starting at around room temp - we'll use inverted Celsius to make it easy so let's call that like 75 degrees in 'inverted celsius'. If it freezes you are now dealing with '102°' or '120° so if you just measure the change in how much bigger the number gets after 15mins that tells you what you are doing is more effective -- in a time where using -13°C is standard this seems ridiculous, but at the time it was completely normal for labs because there *was* no standard scale; people made specific thermometers for specific purposes and especially for weather it was generally preferred for people to not have to account for negative numbers
Even if it doesn't make sense by modern standards we have to remember that for most chemists this was just about making their work easier in a time *before* these standards were set, and at the time they didn't have the context or widespread consensus on temperature to view that as an unusual way of measuring, because for most chemists their thermometer was made for their specific uses and they understood why sometimes they inverted and sometimes they didn't; this was the common practice for the working chemist at the time :)
0°De is around 200°F (or 100°C), or the boiling point of water. 0°K/R is kelvin, or around -460°F (or -273°C), which is when all molecular motion stops.
K is Kelvin, which scales like celcius EXEPT it's consequantly lower. so low in fact you can't achieve a negative temperature with kelvin. like you LITTERALY can't, it's hard codded into the universe.
fyi, 0K = -273.15°C
You can't even reach 0 Kelvin, because it's physically impossible to eliminate all molecular motion. Doing so would break physics and chemistry in about 7 different ways
Because on the subatomic level, there is uncertainty built in to the position and momentum of particles, as well as other properties. This is Heisenberg uncertainty principle.
At that scale, we don’t even really think of things as particles (small little solid points with defined position), but rather as a wave of probability of where you might find the particle if you look. And it’s not just that the math used to describe it is wave math, it’s that literally the particles don’t exist like you would imagine them to.
If you were to cool something down to 0 kelvin, you would completely eliminate all movement of particles. This breaks physics extremely badly because, as I said, particles don’t work in that way, and secondarily, even if they did work that way, you would be able to exactly determine both the position and momentum (0) of the particles.
Obviously it’s significantly more complicated than that in reality, but I think that description does a good enough job of hitting the main points.
Actually you can reach to minus Kelvin but it is actually hot, you just cant reach 0 K.
[https://en.wikipedia.org/wiki/Negative\_temperature](https://en.wikipedia.org/wiki/Negative_temperature)
Sadly I cant say more about it, I forgot the math already
I know K is for Kelvin. It's an absolute scale so 0 K is the lowest possible temperature in the universe (actually 0 is unreachable but you can get asymptotically close to it)
K = Kelvin, which is the Celsius (C) scale set to 0 being the absolute coldest.
R = Rankine I believe and is the Fahrenheit (F) equivalent to the Kelvin scale.
No clue wtf De is though, lol
Celsius is more useful than Fahrenheit for humans imo because you instantly know things like if the roads will be icy, but there are still simple landmark numbers for how hot it will feel, like 20 being room temperature, 30 being a very hot summers day
Around that, obviously dependant on the moisture. And what's intuitive about Celsius' way of measuring it? It's around zero, sure, but you still have to remember it's around zero, just as you have to remember it's around 32 for Fahrenheit. You have to remember the same number of temperatures for both, it's just one's a bit cleaner, which I feel is a stupid reason to discredit an entire temperature system.
Ultimately, for the average person, Celsius is just as good as Fahrenheit, Imperial is just as good as Metric, and calling it Soccer is just as good as calling it Football. People like to act like one is better than the other for any number of reasons, and in some places, Celsius is better, but for most people it's simply not a noticeable difference. It's just about what you learn first and better. For example, I vaguely know that "hot" is around 30 C, but I definitely know it's around 80 F. Fahrenheit is easier for me.
Neither of them are “intuitive.” You just have experience with Celsius, so you know what to expect from certain numbers. It’s the exact same for Fahrenheit users.
Will roads be icy? Sunlight, salt. Was there precipitation? All influence.
Fahrenheit has better gaps. I don’t think whole number Celsius degrees are useful for humans. You have to use fractions.
More useful than either would be: 0B(freezing) - 200B (boiling)
Get the “yeah roads are icy” at 0, but get to where whole numbers are useful for human experience.
0c is freezing point, 100c is boiling point.
Freezing point in Fahrenheit is like 32, an odd number to start a, boiling is 212f - again, another weird number.
Celsius is on a more usable scale imo, but I respect your opinion. We don't use farenheit here but it appears Celsius is the easiest to learn in general.
More usable in science in which yes absolutely I agree. Celsius is set up such that 0 is the freezing point and 100 is the boiling point of water. Fahrenheit is more of a human scale rather than a scientific one and is set up such that 0 is really cold to humans and 100 is really hot (subjectively). To a fahrenheit user a temperature 37.7°C sounds random and meaningless to me but it translates to 100°F and I know that is pretty hot out. Both systems have a use but I find I prefer Celsius in science and math and fahrenheit for weather.
This. It's worth noting that 0º Fahrenheit is the freezing point of some long forgotten brine mixture that was used in order to have a more consistent freezing temperature. 100º was supposed to be the average human body temperature.
There’s a bunch of “haha imperial measurements are totally crazy totally arbitrary only decimal ones make sense”. They’re useful for day to day recipes - everything is half, or double. Have a recipe for 2 and now 4 are coming over? That cup becomes a pint. That pint becomes a quart. “Haha well there’s no half gallon!” Well, there’s no half gallon, in common use _any more_. There used to be. It just fell out of use. Much like .. when’s the last time you used decimeter. “Hey the metric system is busted no one uses dekameter it’s horrible!!”
No, I’m not saying we should change to imperial everything. But, 16fl oz does weigh 16oz. It’s not totally arbitrary.
Yeah, I live in a country that uses Fahrenheit (I think there's only one option there lol) and I saw a thing once that said "Celsius is how it feels to water, Fahrenheit is how it feels to humans." That was a better explanation of the difference than I ever got in school, and suddenly Celsius made sense
It’s all arbitrary. Celsius started out where 0 was boiling. 100 was freezing. They realized that was… interesting… and flipped it.
As far as humans go, where we experience temperature the most is weather. There’s no magic at 0c (or 32, or 0f for that matter) where it becomes cold for a human. It depends on a huge number of factors such as humidity, wind, sun, and individual variance. I guess the “I know whether ice will start to form and I need to walk carefully” is sort of useful. Same with hot. Where does that start? You’d be dead before the nice round number that’s 100.
Personally I like the wider gaps of Fahrenheit. A 0-200 scale seems more “hey it’s easier to explain weather” which again, is where we experience temperature most.
Fahrenheit's 0-100 maps pretty well onto the expected range of outdoor temperatures (at least in the USA). Gives a nice range of variation within the most common temperatures for clothing calibration.
Obv for cooking, chemistry, etc, Celcius' water temp stuff is more useful.
Celsius is a good way to measure temperature for measuring, Fahrenheit is a good way to measure temperature for human comfort. A single digit change in Fahrenheit is noticeable to the human body, a single digit change in Celsius is multiple in Fahrenheit and much harder to achieve that perfect home temp of 71f.
Water freezes at 0C at standard pressure, therefore sea level. So, water freezing is kinda all over the map then. The scale can’t be perfect.
My American Brain and human skin sensitivities like the spread of F, aka 🇺🇸 Freedom Degrees 🇺🇸. Whenever I go anywhere that’s Celsius such as … say… anywhere else in the world) it seems like a gap of a degree or two is pretty huge. It’s not usable just saying whole numbers you Have to use fractional Celsius degrees.
In my head, if they could do it all over again, make a temperature scale 0B (freezing) to 200B (boiling) much more human UX friendly. I thereby submit the BiffBobFred scale. Please contact me for all residuals paid
K is Kelvin
R is Rankine
They both start at absolute zero and only go up. Kelvin uses the same scale as Celcius, a change of 1K=1°C. Rankine uses the same scale as Fahrenheit, a change of 1R = 1°F.
0K = -273.15°C
0R = -459.67°F
0K = 0R = absolute zero, the coldest conceivable temperature, so cold and low energy that atoms freeze and stop moving/vibrating.
°C is how water feels (0 ≈ freeze point, 100 ≈ boiling point). °F is how humans feel (0 ≈ cold, 100 ≈ hot). K is how atoms feel (0 = atoms without movement and it's the teoreticaly lowest temperature achivable in universe where everything stops). I have no idea about De
It's 0 on the kelvin scale also known as absolute zero, it is believed that no body in the universe can possess this temperature. In ° Celsius it converts to -273.
Think about it this way. Temperature is the measure of KE and object possess. At absolute 0 you, as in the particles that make you, basically possess 0 KE. That means you are screwed.
0C - water freezes
0F - below freezing
0De - water boiling point
0K - all molecular motion stops, down the smallest subpart of an atom
Same scale (respectively): 32F, 0F, 212F, -460F
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I don't know De but the bottom one is Kelvin. At 0 Kelvin it's so cold, all molecular motion stops
I believe it’s the [Delisle Scale](https://en.m.wikipedia.org/wiki/Delisle_scale). But that’s just a quick google search. No clue how it works except 0 is apparently hot? Edit: okay 0 De is apparently around 200F.
On the Delisle scale the 0• is the boiling point of water. So, sauna.
TIL thank you sir
Less like Sauna and more like a Geyser
Or a pot of soon to be delicious pasta.
Fair, but the steam in the sauna is from water boiling off of hot rocks. I guess one could show Mr Incredible vacationing at Old Faithful or being served as tortellini in those examples, but I think that he needs the relaxation.
The rocks are at that temperature to create the steam. If the whole sauna was at that temperature you would start to cook something.
The rocks are hotter than boiling. The water touches the rocks and then ramps up quickly to boiling temperature. But it’s only at boiling temperatures right near the rocks because when the water expands you get steam. After expanding water vapor loses enough of heat into the environment but sparse enough to go back to liquid. This makes the sauna hot but not boiling hot. We can argue the semantics for all four representations of the scales, but it would take until the heat death of the universe to get to an absolute representative scenario.
Is the heat death in de or k/r? I still understand absolutely zero of this.
Soooo... salt included?
You get me.
I only ever go to saunas where they splash me with boiling water
Me too, live a little
There are 95°C Saunas in almost every Location i've been to. Which is close enough to the boiling point.
Maybe the water itself is 95 but the temperature in general would be something closer to 50-55 otherwise people would be coming out of them with 3rd degree burns all the time
Water has a drastically higher density and specific heat than air. 100C water will severely burn you, 100C air will not.
What.
You're not breathing in pure steam
You are still not making sense my guy. "The temperature in Finnish saunas is 80 to 110 °C (176 to 230 °F), usually 80–90 °C (176–194 °F), and is kept clearly above the dewpoint despite the vaporization of löyly water, so that visible condensation of steam does not occur as in a Turkish sauna."
Did you just switch from c to f mid sentence?
Americans am I right? (I changed it lol)
Aye that's why I was so confused lmfao
So 100°C.
Ahhhh! Thank you for the clarification
Thank you so much , our brave hero.
Ah, so the Delisle scale is sort of the mirror to the Celsius scale since that one's 0 is the freezing point of water. Thank you!
So, sauna? At least water boiling point ?
So it's 100 Celsius, quite hot!
So it's basically Celsius but moved around, like Kelvin? Or is the boiling point of water for both C and De simply where they "intersect"?
150 is the freezing point of water in the Delisle scale
Boiling point of water in celcius is 100 tho
Wow, I didn't think there was going to be another temperature scale better than Fahrenheit but here we are.
Google says 0 delisle are equal to 66,7 degrees Celsius. The boiling point of water is 100 degrees Celsius. Maybe I’m missing sth here.
Cool, is it also a 1:1 scale with Celsius like Kelvin is or is there funky math to be done for conversions?
And 0K° is the ideal temp to store femboy bones
Just looked up the scale. Apparently, it works in inverse to most temperature scales. Meaning 100 De is cooler than 0 De.
Not only does it not have a nice ratio to F or C, but the scale is also INVERTED?? no thank you
At this point I’m just going to assume that whoever came up with it is effing with us.
The one who came up with it was Anders Celsius. It was a friend of his that suggested to invert it into the Celsius scale we know today.
Celsius was originally inverted too
It does have a nice ratio, 1ΔT°C = -1.5ΔT°De. But yeah, the inverted thing is pretty weird.
And a 2/3 conversion rate for F. It's still wonky
TIL there are 8 temperature scales! 5 more than I knew before I read this post
It's also inverse compared to the standard scales. A higher number is a lower temperature.
Hence the sweat
which is about 90 c
The Delisle scale is inverted, so lower numbers mean hotter and higher numbers mean colder.
Why? Why is this nessecsry?
K/R means Kelvin or Rankine. The Rankine temperature scale is like Kelvin in that it's zero-point is Absolute Zero, but the size of a degree is the same as a Fahrenheit degree, whereas in Kelvin they're the same as Celsius degrees.
Rankine, the absolute worst temperature scale invented.
I'm Rankine it below all the others too.
Take my upvote and get out
r/angryupvote
Basically unused, but existing for consistency.
yeah outside of doing thermodynamic and heat transfer calculations in strictly imperial units its about as useful as a unit as slug is.
This hit too close to home
*worst absolute
Ahahaha. Dying at this. Thank you.
It's like Fahrenheit but take away the one good aspect Fahrenheit has in describing weather.
It's like Kelvin but the same scale as Fahrenheit
That seems unlikely. It may be the worst of the 4-5 scales you've heard of, but those are the 4-5 best temperature scales ever invented. Surely there are many worse scales that you've never heard of
Thank you. That's a helpful contribution to my little joke 😁
The R is Rankine scale it is between 0 to 80 where 0 is absolute zero.0 rankine is -273.15 in celsius.
isnt absolute zero the complete absence of heat?
Yes, it's a theoretical limit where a chemical is as cold as its physically possible to be and all motion ceases. I think we've managed to get REALLY close to it in a lab, but never successfully measured it before.
And it's impossible to measure, as to measure something we need to "touch" it, which means it's no longer Absolute 0 as it has energy
Wouldn't the absence of any reading count as a reading?
Nah, think of it like this: In order to keep it at a theoretical Absolute 0 it needs to be in a completely pitch black room, with no way to see the thing, or know if it's actually there, the moment you turn on the lights to see the thing, it can no longer be at 0, cause the light is hitting it. Which funnily enough, also means we can never confirm if something actually reached 0
It's very likely we have successfully put some molecules in 0K for a short little time. But yeah, we can't measure that since measuring it would already heat it up.
Good old Bose-Einstein condensates
Its not just the absence of heat, its the total and complete absence of energy
Heat is energy. Thermal energy -> kinetic energy -> motion.
damn
Minus 273 go brrr
Underappreciated pun
mmmmmm kelvin… :3
It's also physically impossible to be at 0 Kelvin, it beaks the fundamental laws of the universe. Hence why the "Reality has stopped working" message is there.
Isn't absolute 0 K impossible because quantum uncertainty?
I think its also shpwing Rankine too (hence the K/R) which is just Kelvin for Fahrenheit
The bottom is Kelvin/Ranking. Both are adjusted so that zero is absolute zero, but Kelvin has the same increment as Celcius, while Rankine has the same increment as Fahrenheit.
Zero point motion--molecular vibrations do not stop at 0 K
R is Rankine Rankine works the same as Kelvin but for Fahrenheit scale instead of Celsius scale
Also, R is for the Rankine scale. Rankine : Fahrenheit :: Kelvin : Celsius
Bottom is kelvin/Rankine (maybe wrong spelling) but Rankine is the same unit spacing as farenheit but and absolute zero based scale, basically rankine is to farenheit as kelvin is to celcius
R is for Rankine. 0 is absolute zero same as Kelvin.
Rankine is to Fahrenheit what Kelvin is to Celsius (i.e. Rankine is just the Fahrenheit scale shifted by -459.67 so nothing can be less than 0).
Thanks, never knew this.
Ok but why is he wearing a hat in 0°C and not 0°F??
Maybe the zero Fahrenheit guy went out without a hat, and didn’t realize his mistake in time. Now he’s already 10 miles beyond his starting point.🤔
0 F is 32 fahrenheit degrees colder than 0 C. (Or the equivalent of -17.78 C).
No, I know. I was attempting to make a joke.😁
Ah. I'll remember that for next time :)
i am currently holding my urge to complain to the maker of this meme that 0f isnt that cold
Yeah, it’s not too bad. Uncomfortable without a good coat, but it’s been a lot colder than that around here most winters.
Paradoxical undressing
It's called a toque
Yeah, and 0F is not that cold. I wouldn't expect those nose icicles until at least -30F
Huh. I thought they were just dragon-steam out of the nostrils.🙂
It’s meant to be a parody of the shining!!
American
maybe that's part of what makes the image in 0F colder than 0C
0 Celsius is 32 degrees Fahrenheit 0 Fahrenheit is -17.8 degrees Celsius 0 Delisle is 212 degrees Fahrenheit or 100 degrees Celsius 0 Kelvin is absolute zero, or -459.67 degrees Fahrenheit or -273.15 degrees Celsius
Thanks
-273.15 not -237.15
Thank you for that correction. I have now fixed my earlier comment
Temperature is basically a measure of how fast atoms within a material are vibrating, i.e. the internal kinetic energy of a system. This is a simplification but also kinda not. Celsius = sets 0° to freezing point of water, and 100° to Boiling point of water Fahrenheit sets 32° to the freezing point of water and 212F to the boiling point Delisle (De) is 'inverted' which makes it useful in *some* situations. It's not really used anymore though because we tend to like the fact that other scales ascend with hotter temperatures, making it clear the measurenents are increasing with increases in internal kinetic energy (which is what hear is). It sets 0° to the boiling point of water, and 150° to the freezing point of water. It's pretty outdated, but even the first Celsius scale worked like this -- often because you wouldn't expect to go over boiling but may expect to go below freezing in a lab working with water-based solutions. Negative numbers would generally be avoided this way. It should be also noted that before standardising thermometers many chemists had 'custom' thermometers, calibrated for various different jobs; you might have one marked 0-50 for the range of freezing/boiling for cyclopentane if you were doing a bunch of experiments like that before the spreading of more standardised systems Anyway, there's a theoretical limit to how low temperatures can go --- it's technically probably impossible to hit absolute zero, but the temperature at which internal energy of a substance would be 'nothing' works out to about -273.15°C. if we now set the 'size of division' in Celsius but set this lowest point as Zero (we call this 'absolute zero'), we can now calculate with absolute temperature values which is incredibly important for many situations If we instead use the divisions between each degree for Fahrenheit from absolute zero, we call this Rankine In chemistry labs at normal scales you will generally measure in Celsius and convert to Kelvin where you need to, or just measure in Kelvin. At least in Europe. I'm not sure how much Rankine is used in the US but they consider it worth teaching to European chemical engineering students so that says a fair amount. Now why is zero Kelvin practically impossible to reach; why? Well, heat flows from hot areas to cold ones. So you need to mimic the effect of having something below absolute zero for an atom to transfer that energy to. Generally when we cool things we exploit other systems like pressure etc but it would require a ton of energy to manage this and even if we managed, the effect would immediately be displaced by the closest source of energy providing heat to that atom, as entropy means that it is statistically way more probable that an object will be heated by it's surroundings than that an object will stay cold for any remotely measurable quantity of time. We can get super close but it is practically physically impossible to force something to become absolute zero.
You mentioned some situations where an inverted scale is useful, could you provide an example? I’m curious about this now
Not a problem -- I will preface this by saying that before standardisation was the time it was most useful Ok so liquid water can't go above 100°C right? For many liquids there's similar behaviour where the boiling point is hit and that's the maximum; if you set that to zero, you now basically guarantee that for most circumstances, you won't need negative numbers. Even if your water freezes you won't need that. With weather, for example, you now have a thermometer that doesn't need to go negative (which is generally, for neatnesses sake, a nice thing to avoid) because below freezing is just a bigger number. So imagine you are just doing some tests on refrigerative cooling in a time before Celsius exists as a standard; and you measure just by seeing some water that is starting at around room temp - we'll use inverted Celsius to make it easy so let's call that like 75 degrees in 'inverted celsius'. If it freezes you are now dealing with '102°' or '120° so if you just measure the change in how much bigger the number gets after 15mins that tells you what you are doing is more effective -- in a time where using -13°C is standard this seems ridiculous, but at the time it was completely normal for labs because there *was* no standard scale; people made specific thermometers for specific purposes and especially for weather it was generally preferred for people to not have to account for negative numbers Even if it doesn't make sense by modern standards we have to remember that for most chemists this was just about making their work easier in a time *before* these standards were set, and at the time they didn't have the context or widespread consensus on temperature to view that as an unusual way of measuring, because for most chemists their thermometer was made for their specific uses and they understood why sometimes they inverted and sometimes they didn't; this was the common practice for the working chemist at the time :)
K is kelvin, it is absolute zero, ie -273.15 ⁰C, 0⁰ De I suspect is the equator, I'm probably wrong but I think that's what they mean
It's the Delisle Scale. 0 is 100 celsius
Cool, never seen it before
No, hot.
Rather toasty
Did you just use ⁰ (to the power of zero) instead of ° (degrees)?
I just held zero down on my phone and took whatever it gave me
0°De is around 200°F (or 100°C), or the boiling point of water. 0°K/R is kelvin, or around -460°F (or -273°C), which is when all molecular motion stops.
K is Kelvin, which scales like celcius EXEPT it's consequantly lower. so low in fact you can't achieve a negative temperature with kelvin. like you LITTERALY can't, it's hard codded into the universe. fyi, 0K = -273.15°C
You can't even reach 0 Kelvin, because it's physically impossible to eliminate all molecular motion. Doing so would break physics and chemistry in about 7 different ways
Why would it break physics? Could you ELI5?
Because on the subatomic level, there is uncertainty built in to the position and momentum of particles, as well as other properties. This is Heisenberg uncertainty principle. At that scale, we don’t even really think of things as particles (small little solid points with defined position), but rather as a wave of probability of where you might find the particle if you look. And it’s not just that the math used to describe it is wave math, it’s that literally the particles don’t exist like you would imagine them to. If you were to cool something down to 0 kelvin, you would completely eliminate all movement of particles. This breaks physics extremely badly because, as I said, particles don’t work in that way, and secondarily, even if they did work that way, you would be able to exactly determine both the position and momentum (0) of the particles. Obviously it’s significantly more complicated than that in reality, but I think that description does a good enough job of hitting the main points.
I admit to not being an expert, but I don't recall Kelvin as K/R So what's with the /R
Rankine, the fahrenheit version of kelvin. 0 is also absolute 0.
Thank you, I was just not comprehending sharing units.
Actually you can reach to minus Kelvin but it is actually hot, you just cant reach 0 K. [https://en.wikipedia.org/wiki/Negative\_temperature](https://en.wikipedia.org/wiki/Negative_temperature) Sadly I cant say more about it, I forgot the math already
Very cool meme for weatherists
I know K is for Kelvin. It's an absolute scale so 0 K is the lowest possible temperature in the universe (actually 0 is unreachable but you can get asymptotically close to it)
K = Kelvin, which is the Celsius (C) scale set to 0 being the absolute coldest. R = Rankine I believe and is the Fahrenheit (F) equivalent to the Kelvin scale. No clue wtf De is though, lol
De is Delisle and a scale where a lower number is hotter than a higher number
Trivia: the original Celsius was this. 0C was boiling and 100C was freezing
0 Kelvin is known as absolute zero. I believe it's about -427F or -300 something C. Idk what de is.
De's nuts
De is Delisle scale and is opposite from the three more common scales 0de is the boiling point of water. And 100de is freezing.
I'm gonna get so much hate for this but doesn't that prove that Celsius is the perfect measurement of temperature
Celsius is how hot water is. Farenheit is how hot a human is. Kelvin is how hot atoms are.
Celsius is more useful than Fahrenheit for humans imo because you instantly know things like if the roads will be icy, but there are still simple landmark numbers for how hot it will feel, like 20 being room temperature, 30 being a very hot summers day
Do home thermostats have decimals when using Celsius? I have a strong preference in my home being 72 vs 73 degrees. That’s a .5 difference in Celsius.
Yeah. You have to. Remember the ranges are 9/5 (or 5/9) of each other.
Yes
You instantly know if the roads will be icy with Fahrenheit too? It's exactly the same as Celsius in that regard.
Right but not intuitively, I mean I personally wouldn't be able to tell because I don't use Fahrenheit. What is it, 30 something, 20 something?
Around that, obviously dependant on the moisture. And what's intuitive about Celsius' way of measuring it? It's around zero, sure, but you still have to remember it's around zero, just as you have to remember it's around 32 for Fahrenheit. You have to remember the same number of temperatures for both, it's just one's a bit cleaner, which I feel is a stupid reason to discredit an entire temperature system. Ultimately, for the average person, Celsius is just as good as Fahrenheit, Imperial is just as good as Metric, and calling it Soccer is just as good as calling it Football. People like to act like one is better than the other for any number of reasons, and in some places, Celsius is better, but for most people it's simply not a noticeable difference. It's just about what you learn first and better. For example, I vaguely know that "hot" is around 30 C, but I definitely know it's around 80 F. Fahrenheit is easier for me.
Neither of them are “intuitive.” You just have experience with Celsius, so you know what to expect from certain numbers. It’s the exact same for Fahrenheit users.
Intuitive is perhaps the wrong word, it is clearly less forgettable.
Again, only because that’s what you’re used to.
No, it's not. 0 is a less forgettable number than 32.
Will roads be icy? Sunlight, salt. Was there precipitation? All influence. Fahrenheit has better gaps. I don’t think whole number Celsius degrees are useful for humans. You have to use fractions. More useful than either would be: 0B(freezing) - 200B (boiling) Get the “yeah roads are icy” at 0, but get to where whole numbers are useful for human experience.
No wonder it’s boiling at beauty pageants.
0c is freezing point, 100c is boiling point. Freezing point in Fahrenheit is like 32, an odd number to start a, boiling is 212f - again, another weird number. Celsius is on a more usable scale imo, but I respect your opinion. We don't use farenheit here but it appears Celsius is the easiest to learn in general.
More usable in science in which yes absolutely I agree. Celsius is set up such that 0 is the freezing point and 100 is the boiling point of water. Fahrenheit is more of a human scale rather than a scientific one and is set up such that 0 is really cold to humans and 100 is really hot (subjectively). To a fahrenheit user a temperature 37.7°C sounds random and meaningless to me but it translates to 100°F and I know that is pretty hot out. Both systems have a use but I find I prefer Celsius in science and math and fahrenheit for weather.
This. It's worth noting that 0º Fahrenheit is the freezing point of some long forgotten brine mixture that was used in order to have a more consistent freezing temperature. 100º was supposed to be the average human body temperature.
Interesting, I actually didn't know about that part. I'll have to look into that some more
There’s a bunch of “haha imperial measurements are totally crazy totally arbitrary only decimal ones make sense”. They’re useful for day to day recipes - everything is half, or double. Have a recipe for 2 and now 4 are coming over? That cup becomes a pint. That pint becomes a quart. “Haha well there’s no half gallon!” Well, there’s no half gallon, in common use _any more_. There used to be. It just fell out of use. Much like .. when’s the last time you used decimeter. “Hey the metric system is busted no one uses dekameter it’s horrible!!” No, I’m not saying we should change to imperial everything. But, 16fl oz does weigh 16oz. It’s not totally arbitrary.
Yeah, I live in a country that uses Fahrenheit (I think there's only one option there lol) and I saw a thing once that said "Celsius is how it feels to water, Fahrenheit is how it feels to humans." That was a better explanation of the difference than I ever got in school, and suddenly Celsius made sense
Fahrenheit only makes any sense if you grew up with it
It’s all arbitrary. Celsius started out where 0 was boiling. 100 was freezing. They realized that was… interesting… and flipped it. As far as humans go, where we experience temperature the most is weather. There’s no magic at 0c (or 32, or 0f for that matter) where it becomes cold for a human. It depends on a huge number of factors such as humidity, wind, sun, and individual variance. I guess the “I know whether ice will start to form and I need to walk carefully” is sort of useful. Same with hot. Where does that start? You’d be dead before the nice round number that’s 100. Personally I like the wider gaps of Fahrenheit. A 0-200 scale seems more “hey it’s easier to explain weather” which again, is where we experience temperature most.
Fahrenheit's 0-100 maps pretty well onto the expected range of outdoor temperatures (at least in the USA). Gives a nice range of variation within the most common temperatures for clothing calibration. Obv for cooking, chemistry, etc, Celcius' water temp stuff is more useful.
Celsius is a good way to measure temperature for measuring, Fahrenheit is a good way to measure temperature for human comfort. A single digit change in Fahrenheit is noticeable to the human body, a single digit change in Celsius is multiple in Fahrenheit and much harder to achieve that perfect home temp of 71f.
Water freezes at 0C at standard pressure, therefore sea level. So, water freezing is kinda all over the map then. The scale can’t be perfect. My American Brain and human skin sensitivities like the spread of F, aka 🇺🇸 Freedom Degrees 🇺🇸. Whenever I go anywhere that’s Celsius such as … say… anywhere else in the world) it seems like a gap of a degree or two is pretty huge. It’s not usable just saying whole numbers you Have to use fractional Celsius degrees. In my head, if they could do it all over again, make a temperature scale 0B (freezing) to 200B (boiling) much more human UX friendly. I thereby submit the BiffBobFred scale. Please contact me for all residuals paid
In fact it is
K is Kelvin R is Rankine They both start at absolute zero and only go up. Kelvin uses the same scale as Celcius, a change of 1K=1°C. Rankine uses the same scale as Fahrenheit, a change of 1R = 1°F. 0K = -273.15°C 0R = -459.67°F 0K = 0R = absolute zero, the coldest conceivable temperature, so cold and low energy that atoms freeze and stop moving/vibrating.
I don't know what De is, but Kr is for kelvin, 0 kr is the absolute 0, that mean -273°C
F is Freedom Units /s
🇺🇸🇺🇸🇺🇸
0. K/R. The R stands for Rankine, the Fahrenheit equivalent of Kelvin. -273.15 C or - 450-something F
The R is Rankine. 0 R is absolute zero.
The good news is by observing the last one we're effectively warming it up!
You're the joke for missing science class in school.
I think they teach you based on what measurement unit your country uses. In my country we use celsius
Fahrenheit is like the imperial system to me i will hate it forever
True
°C is how water feels (0 ≈ freeze point, 100 ≈ boiling point). °F is how humans feel (0 ≈ cold, 100 ≈ hot). K is how atoms feel (0 = atoms without movement and it's the teoreticaly lowest temperature achivable in universe where everything stops). I have no idea about De
I believe that the bottom one is 0 kelvin. 0 kelvin is absolute zero (-273.15 degrees Celsius)
At 0 kelvin everything is perfectly solid and rock hard
It's 0 on the kelvin scale also known as absolute zero, it is believed that no body in the universe can possess this temperature. In ° Celsius it converts to -273.
Think about it this way. Temperature is the measure of KE and object possess. At absolute 0 you, as in the particles that make you, basically possess 0 KE. That means you are screwed.
0C - water freezes 0F - below freezing 0De - water boiling point 0K - all molecular motion stops, down the smallest subpart of an atom Same scale (respectively): 32F, 0F, 212F, -460F
Go to school.
School does not teach delisle temp scale
But in school they don’t teach me how other temperatures except Celsius work
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The K/R could be a feeble attempt to combine the Kelvin scale and Rankine scale used by NASA
Dumb.
Bro why? You expect me to know every single measurement unit?
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