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deliquescence del·i·ques·cence (děl'ĭ-kwěs'əns)
The process of dissolving or of becoming liquid through the absorption of moisture from the atmosphere.
the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution. Deliquescence occurs when the vapour pressure of the solution that is formed is less than the partial pressure of water vapour in the air. All soluble salts will deliquesce if the air is sufficiently humid. A substance that absorbs moisture from the air but not necessarily to the point of dissolution is called hygroscopic