Question

at the boiling point of a liquid, even though heat is supplied temperature temperature does not rise till all the liquid has changed into vapour.why

Answer 1

it is because when a liquid boils, some amount of energy is required to to change its state, latent heat of vapourisation. thus all the heat supplied is used to bring about state change and thus temperature does not change

Answer 2

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

Once water starts boiling, all the heat supplied to it is used in conversion of water into steam at the boiling point of water.

Hence, there is no rise in its temperature.

$\large\boxed{\fcolorbox{blue}{yellow} {Additional Information }}$

★ Boiling point of liquid :

The constant temperature at which a liquid transforms into gaseous state is called the boiling point of the liquid.

★ Latent heat of fusion :

The amount of heat energy absorbed at constant temperature by unit mass of a solid to convert into liquid phase is called the specific latent heat of fusion.

★ Latent heat of vaporization :

The amount of heat energy absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase is called the specific latent heat of vaporization.

Hope it helps!

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