A size E cylinder filled with nitrous oxide stores about 1590 L at approximately what pressure?

A size E cylinder filled with nitrous oxide stores about 1590 L at approximately what pressure?

• A. 500 psi
• B. 750 psi
• C. 1000 psi
• D. 1500 psi

Answer: (B)

In nitrous oxide cylinders, the gas is stored as liquid under pressure, so the cylinder pressure is determined by the vapor pressure of N2O at room temperature. For a full nitrous oxide E-cylinder, that vapor pressure is about 745–750 psi. As you withdraw gas, liquid N2O keeps vaporizing to replace it, keeping the pressure steady near that level until most of the liquid is gone. The figure of 1590 L describes how much gas can be released from a full cylinder, not the pressure inside. So the approximate pressure is around 750 psi.

In nitrous oxide cylinders, the gas is stored as liquid under pressure, so the cylinder pressure is determined by the vapor pressure of N2O at room temperature. For a full nitrous oxide E-cylinder, that vapor pressure is about 745–750 psi. As you withdraw gas, liquid N2O keeps vaporizing to replace it, keeping the pressure steady near that level until most of the liquid is gone. The figure of 1590 L describes how much gas can be released from a full cylinder, not the pressure inside. So the approximate pressure is around 750 psi.