For any substance, why does the temperature remain constant during the change of state?
NCERT Class 9th Science Ch 1 Matter in Our Surroundings
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The temperature remains constant during the change of state. The temperature of substance does not increase (or decrease) as the heat is used to overcome the force of attraction (or as the particle come closer). This heat energy absorbed (or released) is known as latent heat. The temperature of the substance remains the same as latent heat is applied to it or supplied to it.
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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.
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