Question

The substances which are capable of holding water molecules from the surroundings at room temperature are known as _______________ substances.

Answer 1

Hygroscopic substance

• 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 Quicklime or Calcium oxide$\left(\mathrm{CaO}\right)$ is a hygroscopic substance.

Therefore, the substances which are capable of holding water molecules from the surroundings at room temperature are known as hygroscopic substance substances.