What will happen to the pressure indicator on a chlorine cylinder with steady temperature until all chlorine has been gasified?

When a chlorine cylinder is maintained at a steady temperature and all chlorine has been gasified, the pressure indicator will remain steady for the duration of the gassing process. This behavior can be explained by the physical properties of gases and the relationship between pressure and temperature as described by Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its absolute temperature when volume is held constant.

As chlorine gas is released from the cylinder, the remaining liquid chlorine continues to vaporize into gas until it is fully emptied. During this process, if the temperature remains constant, the pressure inside the cylinder will not change significantly, reflecting stable conditions. Therefore, the pressure indicator will display a steady reading until all the liquid chlorine has transitioned to gas, after which a rapid drop in pressure may occur as the supply is exhausted. This illustration aids in understanding the principles of gas behavior under constant temperature conditions in a pressurized environment.