Question

Why does boiling point decrease with the vapour pressure?

Answer 1

Boiling point: The boiling point of a substance is the temperature at which the vapour pressure of a liquid equals the pressure surrounding and the liquid converts into a vapour.

• The boiling point of a liquid is affected by the surrounding atmospheric pressure.

The boiling point decrease with the vapour pressure is:

• It has been discovered that if the intermolecular forces are strong, the molecules will be strongly attracted to one another, the vapour pressure will be low, and a lot of energy will be required to separate the molecules. As a result, the boiling point will be very high.
• If the intermolecular interactions are weak, the liquid will have a high vapour pressure and require minimal energy to separate the molecules. As a result, the boiling point will be quite low.
• As a result, we can deduce that vapour pressure and boiling point are inversely related.