The temperature at which water vapourises into steam is called-

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Solution

Heat of vaporization:
The energy needed to change a specific quantity of a substance from the liquid state to the gaseous state at a certain pressure is known as the heat of vaporisation.
At 100°C, water vaporisation heat is 540 cal/g.
Water:
Boiling point refers to the temperature at which water vaporises into steam.
The hydrogen bonds involving the water molecules begin to dissolve as the water reaches its boiling point.
Water changes from a liquid to a gas when it reaches the temperature required for vaporisation.

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When water is heated to a temperature X, it gets converted into steam at temperature X by a process called R. And when steam at temperature X is cooled, it reconverted into the water at the same temperature X by a process called S.

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Q. The increase in internal energy of

1

kg of water at

100^{0} C

when it is converted into steam at the same temperature and at

1 a t m

(100 k P a)

will be [The density of water and steam are

1000 k g / m^{3}

and

0.6 k g / m^{3}

respectively. The latent heat of vapourisation of water is

2.25 \times 10^{6} J / k g

] :