Gas in a gallon of hydrogen

  1. 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!
     
  2. jcsd
  3. Ygggdrasil

    Ygggdrasil 1,570
    Science Advisor

    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.
     
  4. chemisttree

    chemisttree 3,723
    Science Advisor
    Homework Helper
    Gold Member

    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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