How many cubic feet of gaseous hydrogen are in one gallon?

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One gallon of liquid hydrogen contains approximately 4 liters of hydrogen. Given that each mole of hydrogen (2 grams) produces about 23 liters of gas, this translates to roughly 5.5 gallons of gaseous hydrogen. To convert this volume into cubic feet, further calculations based on specific temperature and pressure conditions are necessary. The density of liquid hydrogen is noted as 67.80 kg/m³, which can be used to determine the number of moles in a gallon and subsequently the volume of gaseous hydrogen produced.
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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!
 
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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.
 
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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