Your question is not answerable. PSi is a measure of force or pressure. Cubic feet is a measure of volume.
There can be aby number of psi in a cubic foot because psi is a measurement of pressure and the gas can be any pressure you care to make it.
1 Cubic Foot = 7.48051948 Gallons
Volume is measured in cubic feet. So a cubic foot would have 1 foot height, 1 foot lenghth, and 1 foot width.
1 cubic foot = 1,728 cubic inches
1 cubic foot is about 28.3 (28.3168) liters.
There are 59.8 pints in one (1) cubic foot
About 28.32 liters per cubic foot.
1 cubic foot is 6.2 (6.22883) Imperial gallons.
at $2.15 a gallon, one cubic foot is $0.0591
144 cubic inches are in 1 cubic foot.
There are 1,728 cubic inches per cubic foot.
1 cubic foot.