1.Temperature :-

With increase in temperature the rate of vaporization also increase thus it creates more pressure.

Moreover with increase in temperature the kinetic energy of the vapours also increase.

2. Nature of liquid:-

The liquids with lower inter-particulate attractions have high vapour pressure as the formation of vapours is easy .

Like acetone is easily vaporized as compared to water.

If the liquid is having higher inter-particular attractions it will be hard for the molecules to escape from the liquid state to the gaseous state.

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