Question

Definition of Critical Temperature of a Gas
What is the critical temperature of a gas, and can anyone explain that why gas to be liquefied at its critical temperature?

Answer 1

Critical Temperature and Pressure

Critical Temperature

Gases can be converted to liquids by compressing the gas at a suitable temperature.

Gases become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase.

Microscopic view of a gas.Microscopic view of a liquid.

The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.

Every substance has a critical temperature. Some examples are shown below.