define vapour pressure of a liquid
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- pressure formed by the vapor of the liquid (or solid) over the surface of the liquid. ... Vapour pressure increases with the temperature. The boiling point of the liquid is the point when the pressure exerted by surrounding equals to the pressure exerted by vapor.
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when a liquid in a closed container is in equilibrium with its vapours, the pressure exerted by the vapour on the liquid is its vapour pressure.
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