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Solid - Vapour Equilibrium

The solid phase also exerts its vapour pressure though its value is much smaller than the corresponding liquid phase. Its value also increases with temperature in accordance with the expression

where Δ Hm, subl is the molar enthalpy of sublimation, p is standard unit pressure and I is a constant factor. In some cases, vapour pressure becomes equal to the atmospheric pressure and the solid is passed directly into vapour phase. Such a phenomenon is known as sublimation. Examples of a solid exhibiting such behaviour are iodine and ammonium chloride.

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