Question

Define vapour pressure?

Answer 1

Vapour pressure:

• The pressure exerted by vapour on the surface of the liquid is called vapour pressure.
• The vapour pressure is formed in a thermodynamic equilibrium state in a closed container at a certain temperature.
• The vapour pressure of a liquid depends upon the temperature.
• When temperature increases, the kinetic energy of the molecules increases and due to the increase in kinetic energy the escaping tendency of molecules increases and therefore vapour pressure increases.