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Glossary

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Vapour pressure

Pressure exerted by a vapour when the vapour is in equilibrium with the liquid or solid form, or both, of the same substance ? i.e. when conditions are such that the substance can exist in both or in all three phases. Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.

Reference: Encyclop?dia Britannica Online, 2005

 

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