Question

Give scientific reason:: Even though heat is supplied to boiling water,there is no increase in its temperature.

Answer 1

Heating water up to its bp requires 1 cal/deg/gm. However, at the boiling point, continued heating requires heat to convert to water vapour (that is also occurring at lower temperatures, but at a much reduced level) which requires 540 cal/gm of liquid water. While there is liquid water present the temperature remains constant at a specified (atmospheric) pressure with most of the heat input going into forcing the change of state from the liquid to the vapour and which requires 540/80 times the heat starting from 20 C, as compared with boiling away the same mass of water.

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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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