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

Solution 
During the change of state of any matter heat is supplied to the substance. The molecules of this matter use heat to overcome the force of attraction between the particles, at this period of time, temperature remains constant. This extra heat is acquired by the molecules in the form of hidden heat called latent heat to change from one state of matter to the other state.
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