Air volume in the tank, volume vs pressure

AI Thread Summary
A 5-gallon air tank at 160 psi is equivalent to a 2.5-gallon tank at 320 psi when considering absolute pressures. However, pressures are often expressed as gauge pressure, which excludes atmospheric pressure. To determine how much air is available before the tank is "empty," gauge pressure should be used. Understanding the difference between absolute and gauge pressure is crucial for accurate comparisons. This distinction is important for anyone assessing air tank capacities and performance.
bad_student
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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
 
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bad_student said:
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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.
 
Yes, if those are absolute pressures. But pressures in tanks are often expressed as gauge pressure, which is absolute pressure minus 14.7 psi.
 
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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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