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B Air volume in the tank, volume vs pressure

  1. Feb 4, 2017 #1
    New to forum

    Most air tanks are categorized on volume of air they hold . The question I have is this that a 5 gal air tank that holds 160 psi , is it equivalent to a tank that holds 2.5 gal of air at 320 PSI ?

    if not then is there a formula to figure this ratio .

  2. jcsd
  3. Feb 4, 2017 #2


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    Staff: Mentor

  4. Feb 4, 2017 #2
    Yes, if those are absolute pressures. But pressures in tanks are often expressed as gauge pressure, which is absolute pressure minus 14.7 psi.
  5. Feb 5, 2017 #3


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    Science Advisor

    If you are attempting to measure how much air will come out of the tank before it is "empty" then gauge pressure is an appropriate measure.

    By "empty", I mean gauge pressure zero.
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