Question

Define Hygroscopy.

Answer 1

Hygroscopy: The phenomenon of attracting and holding some molecules of water from the surrounding, at room temperature is called hygroscopy.

• The substances which are performing this is known as hygroscopic substances.
• For example, $\mathrm{Calcium}\mathrm{oxide}\left(\mathrm{CaO}\right)$ is a hygroscopic substance.

Therefore, the phenomenon of attracting and holding some molecules of water from the surrounding, at room temperature is called hygroscopy.