Question

Vapour pressure of a liquid decreases with increase in ________.

Answer 1

Vapour pressure

• Vapour pressure is a measurement of a substance's tendency to transition from a solid, liquid to gas or vapour due to an increase in temperature.
• It measures the rate of liquid evaporation.
• It is strongly connected to how easily particles may leave a liquid or solid state.

Effect of pressure on vapour pressure

• With an increase in pressure, a liquid's vapour pressure decreases.
• As the pressure increases, the molecules of the gas assemble.
• Increased attraction forces between molecules.
• The rate of evaporation reduces as the rate of condensation increases.

Hence, the vapour pressure of a liquid decreases with an increase in pressure.