Question

Under what conditions gases can be liquefied?

Answer 1

Liquefaction of gas:

• It is a physical process in which a gaseous state of substance changes to a liquid state.
• As it is a physical phenomenon the chemical composition remains unchanged.

Conditions for Liquefaction of gas:

• In gases, the intermolecular spaces are very large.
• The two conditions necessary for the liquefaction of gas are:

1. Increasing the pressure
2. Decreasing the temperature

• When gas is compressed too much, heat is produced, so it is necessary to cool it.
• Cooling lowers the temperature of compressed gas and helps in liquefying it.

Hence, a gas can be liquefied by applying high pressure and lowering the temperature.