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Efflorescence, in chemistry, is basically the loss of water of crystallization from a hydrated salt to the atmosphere on exposure to air.

and a salt can lose waters of crystallization only if P_H2O (calculated frm the K _sp for the salt)> Vapour pressure of water in air

here's a small example for u

for the salt, CuSO₄ . 5H₂O <====> CuSO₄ . 3H₂O + 2 H₂O ................ K_sp

here P_H2O = sqrrt (K_sp)

if this value comes to be less than that of Vapour pressure of water in air, sal will not lose its water of crystallization.... as air is already saturated with water vapours

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