B Air volume in the tank, volume vs pressure

1. Feb 4, 2017

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

2. Feb 4, 2017

3. Feb 4, 2017

Staff: Mentor

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

4. Feb 5, 2017

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.