Question

Why does the temperature of a substance remains constant during it's melting or boiling point?​

Answer 1

Answer:

because at this stage the energy supplied is not used to increase the random motion of the constituent molecules...... which is measure of temperature

but

at this stage the energy supplied is used to change the mean distance between molecules which is a part of internal potential energy or the state

Answer 2

Answer:

because the heat absorbed is instantly used to change the state, so temperature remains constant. this hidden heat is called latent heat.

Explanation: