The vapour pressure of a liquid depends upon the nature of liquid and temperature.
Vapour pressure can be defined as the pressure exerted by a vapour with its condensed phases in a closed system at a given temperature. The process of evaporation depends on different factors,
Nature of the liquid
Liquids have weak intermolecular forces. Heating the molecules of the liquid can help change them to the vapour phase and thus increase the vapour pressure of the liquid. For example, Acetone and benzene have higher vapour pressure than water at a particular temperature.
Effect of temperature
The vapour pressure of the liquid increases with an increase in its temperature. The molecules of the liquid have higher energy at higher temperatures.