A hygroscopic substance is one that readily attracts water from its surroundings, through either absorption or adsorption. Examples include honey, glycerin, ethanol, methanol, concentrated sulfuric acid, and concentrated sodium hydroxide (lye).

Which is hygroscopic in nature?

There are many examples in nature of hygroscopic materials but one of the most commonly known is honey as it is primarily a sugar. ... Salt, like sugar, is also hygroscopic in nature and many salts such as calcium chloride and sodium hydroxide are so hygroscopic that they will dissolve in the water they absorb.

Why does Deliquescence occur?

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.