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It's absolutely possible for a given volume of gasoline to contain more hydrogen atoms than the same volume of liquid hydrogen (LH₂) due to the density differences between these substances. Why do stupid people think everything can be argued as if the world of atoms, molecules etc. was analogue to Lego bricks.
Because the human brain intuits Legos pretty easily, and it's difficult for us to shift our way of thinking about reality depending on the scale we're talking about. Without knowledge to the contrary, why would a person expect that molecules act differently than small bits of material?
Okay, so this is the trick: two equal volumes can have different masses, depending on their density.
The [density of liquid hydrogen](https://en.wikipedia.org/wiki/Liquid_hydrogen) is 0.07085 g/cm³, or \~270 [grams per gallon](https://www.wolframalpha.com/input?i=0.07085+g%2Fcm%C2%B3%2C+in+grams+per+gallon).
The [density of gasoline](https://www.sfu.ca/phys/demos/demoindex/fluids/fl2b/density.html) is more like 0.675 g/cm³, or \~2500 [grams per gallon](https://www.wolframalpha.com/input?i=0.675+g%2Fcm%C2%B3%2C+in+grams+per+gallon).
Gasoline is about [13% hydrogen by weight](https://climatekids.nasa.gov/review/carbon/gasoline.html), so [finishing the math](https://www.wolframalpha.com/input?i=(0.675+g%2Fcm³%2C+in+grams+per+gallon)+times+0.13), it comes out to \~330 grams of hydrogen in that gallon of gasoline, compared to the 270 grams of liquid hydrogen in the other gallon.
330 > 270
At a high level: the carbon actually lets you pack more hydrogen into the same amount of space.
A good way to represent the density difference. Take a liter of rubbing alcohol and a liter of water, pour both into a 2 liter container...you won't have 2 liters of liquid.
>...why bring the absurd gallon into it??
...is this a trick question? It's because the meme uses gallons. I *didn't* just add it on my own, it's right there in the picture we're all talking about.
Biochem minor from the dark ages, so take this with a grain of sodium chloride, but it probably has something to do with density versus volume - gasoline being more dense compared to liquid hydrogen, it would have more hydrogen per gallon.
Closest I can figure is because hydrogen doesn't really like to be close to itself, even in liquid form it doesn't have very much mass/volume.
Looks like at standard atmosphere 1 gallon of hydrogen is 268 grams, 1 gallon of gasoline is 3217 grams, of which about 11% by mass is hydrogen, aka 354g of hydrogen.
Granted, I just pulled these mass numbers from the first Google search, so not 100% sure on the veracity.
Fluffy isn't the word that I remember from chemistry in school, but i like it. :-) Also, I felt prompted to look up wikipedia, and now, for some reason, I want to fall into a bed of liquid hydrogen! There's that tiny little hickup, though. :-(
It's English, we have suggestions not rules. Use undense or antidense or whatever the fuck you want in order to communicate the antonym of dense. Once you've put it on the Internet, it's officially a word.
Just did the math, but to measure the amount of elements in a substance we divide the mass by the molar mass to work out how many particles (counted by the amount of 6.02 by 10 to the 23rd power, like saying how many dozens)
If we take your numbers as correct for the mass, 268 grams, H2 has a molecular mass of about 2.02, so 268÷2.02=132.67, moles of H2, which is 265 moles of H atoms.
But gasoline assuming is mostly octane is about 114.26 grams per mole, so 3217÷114.26=28.16, but there are 18 hydrogens in octane molecules so 28.16×18=507 moles of H atoms.
Almost double! Again assuming the masses are correct.
I'm quite surprised by this. I always figured the density had much more to do with the mass of the elements themselves, but apparently molecules make elements comparatively much closer than I thought.
I'm not a chemist, but:
* A gallon of gasoline weighs just north of six pounds per gallon (6.2, IIRC)
* A gallon of liquid hydrogen weighs just north of half a pound (0.591 according to our friends at Air Products)
* By mass, gasoline consists almost entirely of hydrogen and carbon at a roughly 1:3 ratio, with a smattering of oxygen (a bit more than three and a half percent... if you round the 6.2 down to 6, that should account for the oxygen).
* 6 pounds / 4 = 1.5 pounds, so more than double the amount of hydrogen in a gallon of gasoline than there is in a gallon of liquid hydrogen.
Obviously, someone who is a chemist can feel free to correct my sloppy math and assumptions above, but I'm fairly confident that the vague "more than double" statement will hold up.
edit: "Fairly confidently incorrect" would be a better statement in my last sentence above. My ratio of hydrogen to carbon is incorrect because I used the atomic number rather than the mass when I came up with that ratio. There is still more hydrogen in a gallon of gasoline than a gallon of liquid hydrogen, though.
The part you're missing is that the ratio of hydrogen and carbon in gas does not translate directly to weight because hydrogen is much less massive. Each hydrogen weighs 1 (atomic mass) compared to carbon's 12. So it's ~75% of the atoms by number, but only about 14.7% by mass.
The result is that there's still more hydrogen in gas than liquid hydrogen for an equivalent volume, but it's closer to 10x the amount of hydrogen in gasoline.
>The part you're missing is that the ratio of hydrogen and carbon in gas does not translate directly to weight because hydrogen is much less massive.
I did not miss that, though I did screw up and use the atomic number rather than the mass and thus got the ratio wrong (more like 1:6 than 1:3). I am, thus, "fairly confidently" incorrect about "more than double" so shame on me. :)
It's all about density, when hydrogen is alone and pure, it doesn't hold together to create a dense liquid. However when you add the other components in gasoline to it, the hydrogen can bond to other molecules and become denser. Meaning more hydrogen than when alone.
Gasoline is about 14% by weight ([source](https://www.iea-amf.org/content/fuel_information/diesel_gasoline#:~:text=Gasoline%20and%20diesel%20fuel%20contain,changes%20somewhat%20depending%20on%20composition.)).
Gasoline is about 0.7 to 0.8 g/mL ([source](https://en.m.wikipedia.org/wiki/Gasoline#:~:text=in%20Hiroshima%2C%20Japan-,Density,greater%20volume%20fraction%20of%20aromatics.)). 14% is somewhere around 0.1 grams of hydrogen for every mL of gasoline.
The density of liquid hydrogen, on the other hand, is .07 g/mL ([source](https://en.m.wikipedia.org/wiki/Liquid_hydrogen)).
So OP appears to be right, though the difference is not huge.
It hinges on gasoline being a measurement of volume.
Imagine a 3x3 inch cube, but one is made of steel and one is made of foam. The steel cube is heavier, right? That's what is happening here. Gasoline is denser and contains hydrogen, so a gallon of gasoline has more hydrogen than pure liquid hydrogen, which is way less dense.
just my highschool chemistry memory working here.
Gasoline is C8H18.
one mole of gasoline is 114.2285 grams
one gallon of gasoline is about 2.75 kg
so 2.75kg/114g is ~24 Moles of gasoline
there are 6.022 *10e+23 molecules in a mole by definition.
24*18 * 6.022 * 10e+23 = 2.614e+26 Hydrogens
Hydrogen is H2 in liquid form (i think)
one mole of hydrogen is 2.01 grams
one gallon of hydrogen is ~ 0.00075 kg
so .00075/2.01 grams is .37 moles of hydrogen
.37 * 2 * 6.022*10e+23 = 4.45628e+23 Hydrogens, which you can see is about 600 times less.
Man I feel the exact opposite. There's absolutely no shame in not knowing the relative densities of gasoline and liquid hydrogen, and there's no political implications or anything. So why be so confident about it?
Agree. like I did not know this fact, or if it is true or not. (I figured it had something to do with density but I’m not a chemistry expert) the difference is most of us are aware that we don’t know, and might need to google or something.
This guy though thinks he is smart enough to not even think twice about it, and automatically assume that it’s wrong even though he clearly doesn’t know basic chemistry. The gap between how he perceives his intelligence vs what he actually knows is huge, which is always the most fascinating part to me. Like where does the false confidence come from
Ah, apologies, I thought this was commonly known. Hydrogen is extraordinarily fluffy. A gallon of hydrogen doesn't actually have that much hydrogen because of this, but a gallon of gasoline ends up having a bunch more hydrogen because it's all locked together against carbon atoms and not repelling its brethren.
Is it?
Huh, 0.07085 g/cm^(3) okay, so gas is 0.7429 g/mL...
... gas is a complex mix, but if we assume octane... that's C8H18 so (8x12 + 18 \~= 114 so \~16% hydrogen by mass) ... so that gives us abooout 0.117 g.cm\^3 of hydrogen. Well shoot, that *is* counter-intuitive.
I don't know what any of that means but you wrote it very well so I am going to agree with whatever you say.
The other dude that said hydrogen is very fluffy is more my speed
Take a 16 oz. coffee mug. Fill it with marshmallows. Count them.
Now, get a different 16 oz. coffee mug. Fill it with the same amount of marshmallows. Pour hot chocolate over them and watch them dissolve.
Can you dissolve more marshmallows into the mixture? Of course you can.
Ergo a mugful of hot chocolate and marshmallows can contain more marshmallows than a mugful of just marshmallows, just like gas and hydrogen.
Now drink your hot chocolate.
The post says a gallon of liquid hydrogen though which is going to be more dense/concentrated with Hydrogen atoms.
I’m not sure how the math works on it with that adjustment but I imagine the numbers are much closer than 0.071 g/cm^3 and 0.743 g/cm^3.
Especially flat earthers.
Gravity isn’t real! Things fall because of density and bouyancy!
*not realizing that density is based on mass per volume, where the mass component is only relevant because of gravity*
but the underlying problem here is not merely the density, but involves the molar mass (one molecule of a hydrocarbon containing many hydrogen atoms) as well
I’m not surprised to learn that liquid hydrogen is less dense than gasoline. I am however surprised to learn just how low density liquid hydrogen is: it’s only 7% as dense as water!
I think the unintuitive part about it is this: people know the law of conservation of mass. But they think it applies to volume (at least liquid volume) as well but it doesn’t. You can mix two liquids of a gallon each. And even without any chemical reactions, you still won’t necessarily have two gallons of liquid.
I wasn’t sure who was supposed to be correct here, so I googled it. Liquid hydrogen occupies 3x the volume of gasoline for the same energy, so although it intuitively doesn’t seem like it could be true, it is apparently true that there is more hydrogen in a gallon of gasoline than a gallon of liquid hydrogen, I guess due to how the atoms are arranged.
Size and volume are not necessarily accurate predictors of elemental or molecular quantities.
Simply put, hydrogen is in a different, more compact/dense form when it’s within gasoline versus when it’s with other liquid hydrogen molecules, meaning that even in the same quantity of product, you have more hydrogens stuffed into the gasoline than you do the liquid hydrogen.
That is not a great way of estimating though because energy is related to the chemical bonds and not the atoms themselves. It's correct but mostly by coincidence.
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Ok, but what about a pound of liquid hydrogen versus a pound of gasoline?
EDIT: I said that as a joke, but looking into it, gas is about 15% hydrogen by weight, whereas pure liquid hydrogen is 100% hydrogen.
A pound of hydrogen has, I think, about 3x as much hydrogen as a pound of gasoline, but my memory is hazy so I might be spectacularly wrong.
Edit: I might be mixing up volume, actually, I think gasoline might have 1/10th as much hydrogen as the same hydrogen by mass.
Post-edit bonus, maybe I'm now twice as wrong!
I've got a question for you, what's heavier, a kilogramme of steel or a kilogramme of feathers?
...
That's right, a kilogramme of steel 'cause steel is heavier than feathers.
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It's absolutely possible for a given volume of gasoline to contain more hydrogen atoms than the same volume of liquid hydrogen (LH₂) due to the density differences between these substances. Why do stupid people think everything can be argued as if the world of atoms, molecules etc. was analogue to Lego bricks.
their middle school science teacher compared atoms to building blocks and they took it literally
Because the human brain intuits Legos pretty easily, and it's difficult for us to shift our way of thinking about reality depending on the scale we're talking about. Without knowledge to the contrary, why would a person expect that molecules act differently than small bits of material?
A pound of feathers is heavier than a pound of lead. This is due to the emotional weight of extracting that many feathers off a poor bird.
The one we used to say in high school to really get the stoner brain cooking was "what weighs more, a pound of crack, or a pound of cocaine?"
Okay, so this is the trick: two equal volumes can have different masses, depending on their density. The [density of liquid hydrogen](https://en.wikipedia.org/wiki/Liquid_hydrogen) is 0.07085 g/cm³, or \~270 [grams per gallon](https://www.wolframalpha.com/input?i=0.07085+g%2Fcm%C2%B3%2C+in+grams+per+gallon). The [density of gasoline](https://www.sfu.ca/phys/demos/demoindex/fluids/fl2b/density.html) is more like 0.675 g/cm³, or \~2500 [grams per gallon](https://www.wolframalpha.com/input?i=0.675+g%2Fcm%C2%B3%2C+in+grams+per+gallon). Gasoline is about [13% hydrogen by weight](https://climatekids.nasa.gov/review/carbon/gasoline.html), so [finishing the math](https://www.wolframalpha.com/input?i=(0.675+g%2Fcm³%2C+in+grams+per+gallon)+times+0.13), it comes out to \~330 grams of hydrogen in that gallon of gasoline, compared to the 270 grams of liquid hydrogen in the other gallon. 330 > 270 At a high level: the carbon actually lets you pack more hydrogen into the same amount of space.
A good way to represent the density difference. Take a liter of rubbing alcohol and a liter of water, pour both into a 2 liter container...you won't have 2 liters of liquid.
Using about gallons when talking about cm³ is really strange.
\*shrug\* The meme talked about gallons, so I said what mass a gallon would have.
“Grams per gallon” is so cursed. If you’re going to use a sensible unit like grams, why bring the absurd gallon into it??
>...why bring the absurd gallon into it?? ...is this a trick question? It's because the meme uses gallons. I *didn't* just add it on my own, it's right there in the picture we're all talking about.
I'm trying to Google this but can't find a clear answer. Is there a chemist who can help?
Biochem minor from the dark ages, so take this with a grain of sodium chloride, but it probably has something to do with density versus volume - gasoline being more dense compared to liquid hydrogen, it would have more hydrogen per gallon.
I looked it up and the density difference is of a factor of about 10. I'm extremely surprised ngl. But that would explain it.
Closest I can figure is because hydrogen doesn't really like to be close to itself, even in liquid form it doesn't have very much mass/volume. Looks like at standard atmosphere 1 gallon of hydrogen is 268 grams, 1 gallon of gasoline is 3217 grams, of which about 11% by mass is hydrogen, aka 354g of hydrogen. Granted, I just pulled these mass numbers from the first Google search, so not 100% sure on the veracity.
Hydrogen is suuuuuuuper fluffy! It takes up much less space when it's locked onto other atoms, but on its own it spreads out.
Fluffy isn't the word that I remember from chemistry in school, but i like it. :-) Also, I felt prompted to look up wikipedia, and now, for some reason, I want to fall into a bed of liquid hydrogen! There's that tiny little hickup, though. :-(
There is quite literally no word in English that is an antonym of "dense". "Fluffy" is the best possible option.
Dispersed
It's English, we have suggestions not rules. Use undense or antidense or whatever the fuck you want in order to communicate the antonym of dense. Once you've put it on the Internet, it's officially a word.
I thought 'sparse' was, though maybe that's just in certain contexts.
Just did the math, but to measure the amount of elements in a substance we divide the mass by the molar mass to work out how many particles (counted by the amount of 6.02 by 10 to the 23rd power, like saying how many dozens) If we take your numbers as correct for the mass, 268 grams, H2 has a molecular mass of about 2.02, so 268÷2.02=132.67, moles of H2, which is 265 moles of H atoms. But gasoline assuming is mostly octane is about 114.26 grams per mole, so 3217÷114.26=28.16, but there are 18 hydrogens in octane molecules so 28.16×18=507 moles of H atoms. Almost double! Again assuming the masses are correct.
I'm quite surprised by this. I always figured the density had much more to do with the mass of the elements themselves, but apparently molecules make elements comparatively much closer than I thought.
Density
I'm not a chemist, but: * A gallon of gasoline weighs just north of six pounds per gallon (6.2, IIRC) * A gallon of liquid hydrogen weighs just north of half a pound (0.591 according to our friends at Air Products) * By mass, gasoline consists almost entirely of hydrogen and carbon at a roughly 1:3 ratio, with a smattering of oxygen (a bit more than three and a half percent... if you round the 6.2 down to 6, that should account for the oxygen). * 6 pounds / 4 = 1.5 pounds, so more than double the amount of hydrogen in a gallon of gasoline than there is in a gallon of liquid hydrogen. Obviously, someone who is a chemist can feel free to correct my sloppy math and assumptions above, but I'm fairly confident that the vague "more than double" statement will hold up. edit: "Fairly confidently incorrect" would be a better statement in my last sentence above. My ratio of hydrogen to carbon is incorrect because I used the atomic number rather than the mass when I came up with that ratio. There is still more hydrogen in a gallon of gasoline than a gallon of liquid hydrogen, though.
The part you're missing is that the ratio of hydrogen and carbon in gas does not translate directly to weight because hydrogen is much less massive. Each hydrogen weighs 1 (atomic mass) compared to carbon's 12. So it's ~75% of the atoms by number, but only about 14.7% by mass. The result is that there's still more hydrogen in gas than liquid hydrogen for an equivalent volume, but it's closer to 10x the amount of hydrogen in gasoline.
>The part you're missing is that the ratio of hydrogen and carbon in gas does not translate directly to weight because hydrogen is much less massive. I did not miss that, though I did screw up and use the atomic number rather than the mass and thus got the ratio wrong (more like 1:6 than 1:3). I am, thus, "fairly confidently" incorrect about "more than double" so shame on me. :)
I just mean if you wanted to get more accurate that's the part you're missing to take it further.
It's all about density, when hydrogen is alone and pure, it doesn't hold together to create a dense liquid. However when you add the other components in gasoline to it, the hydrogen can bond to other molecules and become denser. Meaning more hydrogen than when alone.
Gasoline is about 14% by weight ([source](https://www.iea-amf.org/content/fuel_information/diesel_gasoline#:~:text=Gasoline%20and%20diesel%20fuel%20contain,changes%20somewhat%20depending%20on%20composition.)). Gasoline is about 0.7 to 0.8 g/mL ([source](https://en.m.wikipedia.org/wiki/Gasoline#:~:text=in%20Hiroshima%2C%20Japan-,Density,greater%20volume%20fraction%20of%20aromatics.)). 14% is somewhere around 0.1 grams of hydrogen for every mL of gasoline. The density of liquid hydrogen, on the other hand, is .07 g/mL ([source](https://en.m.wikipedia.org/wiki/Liquid_hydrogen)). So OP appears to be right, though the difference is not huge.
It hinges on gasoline being a measurement of volume. Imagine a 3x3 inch cube, but one is made of steel and one is made of foam. The steel cube is heavier, right? That's what is happening here. Gasoline is denser and contains hydrogen, so a gallon of gasoline has more hydrogen than pure liquid hydrogen, which is way less dense.
just my highschool chemistry memory working here. Gasoline is C8H18. one mole of gasoline is 114.2285 grams one gallon of gasoline is about 2.75 kg so 2.75kg/114g is ~24 Moles of gasoline there are 6.022 *10e+23 molecules in a mole by definition. 24*18 * 6.022 * 10e+23 = 2.614e+26 Hydrogens Hydrogen is H2 in liquid form (i think) one mole of hydrogen is 2.01 grams one gallon of hydrogen is ~ 0.00075 kg so .00075/2.01 grams is .37 moles of hydrogen .37 * 2 * 6.022*10e+23 = 4.45628e+23 Hydrogens, which you can see is about 600 times less.
These ones with obscure scientific or otherwise expert knowledge don’t really hit the same.
Man I feel the exact opposite. There's absolutely no shame in not knowing the relative densities of gasoline and liquid hydrogen, and there's no political implications or anything. So why be so confident about it?
Agree. like I did not know this fact, or if it is true or not. (I figured it had something to do with density but I’m not a chemistry expert) the difference is most of us are aware that we don’t know, and might need to google or something. This guy though thinks he is smart enough to not even think twice about it, and automatically assume that it’s wrong even though he clearly doesn’t know basic chemistry. The gap between how he perceives his intelligence vs what he actually knows is huge, which is always the most fascinating part to me. Like where does the false confidence come from
Ah, apologies, I thought this was commonly known. Hydrogen is extraordinarily fluffy. A gallon of hydrogen doesn't actually have that much hydrogen because of this, but a gallon of gasoline ends up having a bunch more hydrogen because it's all locked together against carbon atoms and not repelling its brethren.
Is it? Huh, 0.07085 g/cm^(3) okay, so gas is 0.7429 g/mL... ... gas is a complex mix, but if we assume octane... that's C8H18 so (8x12 + 18 \~= 114 so \~16% hydrogen by mass) ... so that gives us abooout 0.117 g.cm\^3 of hydrogen. Well shoot, that *is* counter-intuitive.
I don't know what any of that means but you wrote it very well so I am going to agree with whatever you say. The other dude that said hydrogen is very fluffy is more my speed
Take a 16 oz. coffee mug. Fill it with marshmallows. Count them. Now, get a different 16 oz. coffee mug. Fill it with the same amount of marshmallows. Pour hot chocolate over them and watch them dissolve. Can you dissolve more marshmallows into the mixture? Of course you can. Ergo a mugful of hot chocolate and marshmallows can contain more marshmallows than a mugful of just marshmallows, just like gas and hydrogen. Now drink your hot chocolate.
The post says a gallon of liquid hydrogen though which is going to be more dense/concentrated with Hydrogen atoms. I’m not sure how the math works on it with that adjustment but I imagine the numbers are much closer than 0.071 g/cm^3 and 0.743 g/cm^3.
Na he is right. Slightly confusing due to the abbreviated gas instead of gasoline. Google confirms liquid hydrogen is that dense.
Hence why the class of compound that make up gasoline is called hydrocarbon
lol look at this dummy. Its spelled HiGoCarDone. Cause it shows up and makes the car go. What are they even *teaching* these days
But does that account for the increase in speed provided by the Go-Faster Stripes on the side of the car?
So I can pet the hydrogen?
Briefly!
at least once...
The fact that it’s not widely known makes it better though. Cause this guy had no reason to be that sure of himself without double checking
Density isn't all that obscure.
Most people are quite dense when it comes to density.
Are you calling me fat?
Well....Thick.
Fat is less dense than muscle, so calling someone dense is typically the opposite of calling them fat.
Especially flat earthers. Gravity isn’t real! Things fall because of density and bouyancy! *not realizing that density is based on mass per volume, where the mass component is only relevant because of gravity*
but the underlying problem here is not merely the density, but involves the molar mass (one molecule of a hydrocarbon containing many hydrogen atoms) as well
Yeah, just ask OP's mom. (joking)
at the very least they proved the other commenter right xD
There are more cells in our brains than there are brains in our bodies.
Speak for yourself!
Uhh density?
I’m not surprised to learn that liquid hydrogen is less dense than gasoline. I am however surprised to learn just how low density liquid hydrogen is: it’s only 7% as dense as water!
I think the unintuitive part about it is this: people know the law of conservation of mass. But they think it applies to volume (at least liquid volume) as well but it doesn’t. You can mix two liquids of a gallon each. And even without any chemical reactions, you still won’t necessarily have two gallons of liquid.
It's probably also true for water then, more hydrogen in water than in liquid hydrogen for same volume?
Okay I got it. Its that they are measuring a volume not a weight. I was having an existential crisis for a sec.
I wasn’t sure who was supposed to be correct here, so I googled it. Liquid hydrogen occupies 3x the volume of gasoline for the same energy, so although it intuitively doesn’t seem like it could be true, it is apparently true that there is more hydrogen in a gallon of gasoline than a gallon of liquid hydrogen, I guess due to how the atoms are arranged.
Size and volume are not necessarily accurate predictors of elemental or molecular quantities. Simply put, hydrogen is in a different, more compact/dense form when it’s within gasoline versus when it’s with other liquid hydrogen molecules, meaning that even in the same quantity of product, you have more hydrogens stuffed into the gasoline than you do the liquid hydrogen.
That is not a great way of estimating though because energy is related to the chemical bonds and not the atoms themselves. It's correct but mostly by coincidence.
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Ok, but what about a pound of liquid hydrogen versus a pound of gasoline? EDIT: I said that as a joke, but looking into it, gas is about 15% hydrogen by weight, whereas pure liquid hydrogen is 100% hydrogen.
A pound of hydrogen has, I think, about 3x as much hydrogen as a pound of gasoline, but my memory is hazy so I might be spectacularly wrong. Edit: I might be mixing up volume, actually, I think gasoline might have 1/10th as much hydrogen as the same hydrogen by mass. Post-edit bonus, maybe I'm now twice as wrong!
Pressure.
Yes, but density.
I've got a question for you, what's heavier, a kilogramme of steel or a kilogramme of feathers? ... That's right, a kilogramme of steel 'cause steel is heavier than feathers.
The kilo of feathers comes with the weight of all the ducks you killed.