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All salts don't gain weight on exposure to atmosphere, some also lose weight and some show no change. There are two terms associated with these phenomena: efflorescence1 and deliquescence.

Some salts absorb moisture from the atmosphere and dissolve in the absorbed moisture. Such substance is called deliquescent and phenomena deliquescence.Due to the extra water(moisture) added to the salt it gains weight.

Common salt is not deliquescent but a small amount of deliquescent calcium and magnesium chloride impurities present in it absorb moisture from atmosphere and turn common salt wet and sticky ( especially during humid conditions)

1. Efflorescence is the phenomena in which crystalline hydrated salts lose their water of crystallization, change to amorphous state and show a decrease in weight.

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