What is vapour pressure?

Solution:
Vapour pressure is defined as the pressure exerted by the vapour present above the surface of liquid. 
Vapour pressure is defined when rate of evaporation is equal to rate of condensation. 
1) Vapour pressure is directly proportional to temperature.
2) Vapour pressure depends on force of attraction between liquid. Greater the force of attraction between liquid, lower the vapour pressure. 
 

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