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PostPosted: Wed Feb 01, 2017 4:26 pm 
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Something has been bothering me since the mid 80's. I don't know if it has been discussed before, or if I'm just an idiot.

It appears as though the volume of a ton of hydrogen is off by a factor of 3.

As near as I can tell, one kilogram of hydrogen gas takes up 11.125 cubic meters at 32 °F and 14.7 psi.

One kilogram of liquid hydrogen takes up 14.125 liters at its boiling point of -423.17 °F and 14.7 psi.

Obviously, the volume will vary depending on the temperature and pressure. I've seen various numbers given online which are reasonably close to these.

Some examples are:

http://hydrogen.pnl.gov/tools/hydrogen- ... calculator

http://www.uigi.com/h2_conv.html

http://www.airproducts.com/products/Gas ... rogen.aspx

Has anyone else noticed this, or am I just plain nuts?

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PostPosted: Wed Feb 01, 2017 5:18 pm 
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Apparently, I'm just an idiot. :D

If one tonne of liquid hydrogen takes up 14.125 kiloliters and one kiloliter is defined as one cubic meter, then it all makes sense. It was the volume of hydrogen gas which threw me off. Damn metric system.

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PostPosted: Wed Feb 01, 2017 6:57 pm 
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°F? psi? What are these crazy moon units? Are you sure you don't have some fathoms per fortnight in there somewhere? :P

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PostPosted: Thu Feb 02, 2017 10:45 pm 
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Je ne parle pas Français. Je suis un Américain.

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