Question

why there is no further raise in temperature, when we heat a liquid at its boiling point

Answer 1

due to latent heat of vaporisation there is no further change in temperature
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Answer 2

There is no further raise in temperature,when we heat a liquid at its boiling point due to latent heat of vaporization.Latent heat of vaporization means when 1kg of liquid changes into gas at a fixed temperature(100 degree Celsius).