Hydrogen gas to Liters calculation

Discussion in 'General Science' started by gusmas, Feb 28, 2012.

  1. gusmas

    Thread Starter Active Member

    Sep 27, 2008

    Is there a general formula to convert a hydrogen gas canister with a know pressure into it's equivalent quantity in liters?

    Because I am using a hydrogen fuel cell and its consumption is rated at 14 Liters per minute, but as far as I know hydrogen gas is measured in pressure so I need to be able to calculate how much hydrogen gas at a known pressure I will require to let say for example keep the fuel cell running for exactly 1 min. ( in other words 14 Liters of hydrogen).

  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Probably start with the ideal gas law: PV=nRT.

    You need to know the container [gas bottle] volume as well as the container pressure. Temperature is also a required factor. This will give you the number of moles of gas contained - perhaps a more relevant number. Remember 1 mole = 22.4 L at STP.

    I think you will need more information such as the fuel cell gas inlet conditions as well.

    There are many on-line calculators such as


    which includes calculations for non-ideal behavior.
    Last edited: Feb 28, 2012
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