Pressure doesn't change when you change substance, 120 PSI in water equals 120 PSI in air.
Depends on the size of the cylinder, if the air is compressed or not and if it is compressed, to how much psi.
When testing a dry standpipe with air, 40 psi for 24 hours is required. In addition to this air test, the piping of the standpipe also needs to undergo a hydrostatic test for 2 hours at 200 psi.
That'd be 3256.23
44 psi
A lot
That would be to deflate it.
Three psi single vehicle, four psi combination.
30 psi
2000 Psi
Front 28 PSI. Rear 38 PSI.
36 psi36 psi