# Gas in a gallon of hydrogen

by GTeclips
Tags: gallon, hydrogen
 P: 23 Hello. I'm just wondering how many cubic feet of gaseous hydrogen are in one gallon of liquid hydrogen. I know I'm not being too specific and that many variables are involved (temperature, atmospheric pressure... etc), but approximately how many are in a gallon? And yes, I have checked Google. I have found nothing useful. I wish to perform small scale experiments with hydrogen as a lifting gas in small balloons, in case you're curious. Sorry for not using metric, I'm used to U.S. Thank you!
 Sci Advisor P: 1,273 Well, the density of liquid hydrogen is 67.80 kg/m³. From this value, you can find the number of moles of hydrogen in a gallon of liquid hydrogen, and from that number you can calculate the volume of gaseous hydrogen at your specified temperature and pressure.
 PF Patron HW Helper Sci Advisor P: 3,720 Without being too precise, there about 4L per gallon. Each mole of hydrogen (2g) should produce about 23 L of gas or 5.5 gal. You will need to determine the volume in cubic feet per gallon.

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