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What is a vapour pressure of liquid ? Wh...

What is a vapour pressure of liquid ? What is relative lowering of vapour pressure ?

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(i) The pressure of the vapour in equilibrium with its liquid is called vapour pressure of the liquid at the given temperature.
(ii) The relative lowering of vapour pressure is defined as the ratio of lowering of vapour pressure to vapour pressure of pure solvent.
Relative lowering of vapour pressure `=(P _("solvent")-P _("solution"))/(P _("solvent"))`
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