Question

What is hygroscopy?

Answer 1

Hygroscopy-

• It is a process in which water is absorbed from the air but it is not enough to change the state of the substance. The substance which follows this process is called a hygroscopic substance.
• In other words, the substance is able to consistently attract water from its surroundings via adsorption or absorption

Examples-

• Calcium oxide $\left(\mathrm{CaO}\right)$
• Calcium chloride $\left({\mathrm{CaCl}}_2\right)$
• Sodium sulphate $\left({\mathrm{Na}}_2{\mathrm{SO}}_4\right)$ etc.