Define Vapour Pressure


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 equilibrium vapour pressure is a well-known measure of a liquid’s evaporation rate.The propensity of particles to escape from the liquid or a solid is known to be related. The term “volatile material” refers to a substance that has a high vapour pressure at normal temperature. It should be remembered that vapour pressure refers to the pressure exerted by a vapour above a liquid surface.

  • It is important to note that the vapour pressure of a liquid is dependent on the temperature – a liquid can exhibit different vapour pressures at different temperatures.
  • The boiling point of a liquid can also be defined in terms of its vapour pressure as – the point of temperature at which the vapour pressure of the liquid becomes equal to the vapour pressure of its surroundings.

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