Question

Why does the temperature of a substance remain constant during its melting or boiling point???

Answer 1

During boiling or melting, all the heat energy is used up. Until the substance reaches its boiling point, there is no more heat energy left. So ,that's the reason, the temperature remains constant.

Answer 2

Heya,

The temperature of a substance remains constant during its melting point or boiling point. This is because:-

∞) The excess heat supplied to the substance(latent heat) is used by the substance to change its state from solid --------> liquid----------> gas and vice versa.

∞)When ice is heated temperature rises up and makes use of the heat until it reaches 0 degrees. Later it starts melting to form water.

∞) When a substance is heated the temperature remains constant because the excessive amount of heat produces kinetic energy to molecules which helps in the change of state.

∞)So, when a substance is heated the temperature remains constant without changing.

Hope it helps u.....