Question

What is liquefaction point?

• A. the constant temperature at which a gas becomes liquid under normal pressure.
• B. the constant temperature at which a solid becomes gas under normal pressure.
• C. the constant temperature at which a liquid changes into a solid by giving out heat energy.
• D. the constant temperature at which a liquid changes into a gas by giving out heat energy.

Answer 1

The correct option is A the constant temperature at which a gas becomes liquid under normal pressure.

Liquefaction of gases is the process by which substances in their gaseous state are converted to the liquid state.

When pressure on a gas is increased, its molecules closer together, and its temperature is reduced, which removes enough energy to make it change from the gaseous to the liquid state.

This temperature is called Liquefication point at which gas is converted into solid.

Hence, the correct option is $\text{A}$