Question

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

Answer 1

hey mate your answer is here:-

the temperature remains constant during the change of state. because the heat energy supplied is used up in changing the state of Matter this heat is also used for breaking of several bonds or attractive forces

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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.