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 what is vapour pressure?

Vapour pressure of a liquid at any temperature can be defined as the pressure exerted by the vapours of the liquid in equilibrium with the liquid itself. The vapour pressure of any liquid depends upon the nature of liquid and the temperature.

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The pressure exerted by a substance when it is in vapour state :)

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the pressure exerted by a substance on the surface of that substance is called

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its the pressure exerted by vapours of a substance on the walls of container.

gud luck:))

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pressure exerted by the vapours of substance on its surface when they both are in equilibrium with each other i.e. rate of condensation = rate of evapouration.... 

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