Question

What do you mean by change of state of matter? Explain the change of a liquid into a gas at a constant temperature.

Answer 1

• The change from one state of matter to another by absorbing/releasing heat energy is known as change of state.
• The process of change of a substance from the liquid state to its gaseous state at a particular temperature, called the boiling point, is called boiling or vaporization.
• The heat energy absorbed by a substance in liquid state increases the energy of its molecules due to which they begin to move randomly. Thus, a liquid changes into a gas