Question

Why does the temperature remain constant during the boiling of water even though heat is supplied?

Answer 1

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The temperature remains constant during boiling of water even though heat is supplied constantly because all the heat energy provided is used up in changing the state of water from liquid to gaseous water vapour. Therefore all the heat energy provided increases the kinetic energy of the particles and temperature doesn't increase.

latent heat

Answer 2

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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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