Question

The temperature remains constant during boiling of a liquid explain?

Answer 1

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Changing liquid to gas. When a liquid—such as water—is heated at a constant pressure, some of its molecules get enough KE to escape the liquid. Thus, more heat energy is needed to cause other molecules to escape. This keeps the liquid at a temperature slightly below that of the boiling point.

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Answer 2

The temperature of a liquid remains constant while heating because when heated the molecules absorb heat and start vibrating. The heat energy is stored as kinetic energy in the molecules and it does not absorb more heat. Thus the temperature remainss constant.