Air volume in the tank, volume vs pressure

[bad_student]

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 .

Thanks

 

[russ_watters]

New to forum

Welcome to PF!

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 ?

Yes.

 

[Chestermiller]

Yes, if those are absolute pressures. But pressures in tanks are often expressed as gauge pressure, which is absolute pressure minus 14.7 psi.

 

[jbriggs444]

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.