The Combined gas law is a useful tool to based on the ideal gas law equation that will relate Pressure, Volume, and Temperature.
Pressure 1         ATM kPA PSI Bar Torr Meters of water
Volume 1           Liter ml Gal [US] ft^3 in^3 Barrel [US]
Temperature 1 *K *C
Pressure 2         ATM kPA PSI Bar Torr Meters of water
Volume 2           Liter ml Gal [US] ft^3 in^3 Barrel [US]
Temperature 2 *K *C
Calculate