During latent heat of vapourisation when heat is supplied to water. Why the kinetic energy does not increases?

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Solution

When the temperature of a substance is raised, the energy gained by the particles by those substances is used by them in the vibration made by them or movements in the respective medium. This is the kinetic energy utilised. However, the latent heat is the heat which is sufficient enough to break the weak forced between the particles, and allows them to break free from that state. Thus, all the latent heat is used up in converting the state from one to another by breaking bonds and no extra energy is left behind to be utilised as kinetic energy.

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