The property of a substance to absorb moisture from the air on exposure is called

Deliquescent substances keep absorbing water until they dissolve themselves into liquid solutions. This process is called deliquescence. Soluble salts are examples of deliquescent substances. ... Substances that absorbs moisture and becomes wet.

Deliquescence is the process by which substance absorb moisture from the atmosphere until it dissolve in absorbed water and from a solution. Deliquescence occure when the vapour pressure of the solution that is formed is less than the partial pressure of water vapour in the air .