<prompt> All statements are true about gas cylinders exceptPressure of N2O is 745 psig at 20 degrees centigradeHigher pressure indicates impurity in N2ON2O is in liquid formEmergency oxygen E cylinder has more gas than H cylinder  <response>: .N20 is stored in blue steel cylinders as a colorless liquid under 745 psi pressure and is in equilibrium with the gas phase approximately 50 atmospheres at room temperature. The tank maintains that pressure until it is empty. 