Question

for any substance why does the temperature remain constant during the change of state​

Answer 1

Answer:

Because of latent heat.

Explanation:

latent Heat does not add up to the temprature that we usually measure so the change in state is caused by absorbing or emitting latent heat does not effect the physical temprature

Answer 2

Because with the increase of temperature, more number of particles get enough kinetic energy to go into the vapour state. Hence temperature remains constant during the change of state.