Vapour pressur

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The pictur shaws the pairticle transition, as a result o thair vapor pressur, frae the liquid phase tae the gas phase an converse.

Vapour pressur or equilibrium vapour pressur is defined as the pressur exertit bi a vapour in thermodynamic equilibrium wi its condensed phases (solit or liquid) at a gien temperatur in a closed seestem.