Question

For any substance, why does the
temperature remain constant
during the change of state?​

Answer 1

Answer:

because the heat energy supplied to the substancs is used up in overcoming the force of attraction without increasing kinetic energy.

Answer 2

Explanation:

During change of state, for example from liquid state to gaseous state, heat is absorbed and the energy is used to change its state. This absorption of heat energy does not result in change of temperature. This heat energy is called latent heat or hidden heat.

Temperature is not the indication of amount of heat content of a body. It is the parameter that determines the direction of heat flow when two bodies are kept in contact.

Hence when changing from liquid state to gaseous state, the energy of the body increases but the temperature remains constant initially, as temperature does not indicate the heat content of the body.