When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :

(a) rises very slowly (b) rises rapidly until steam is produced

(c) first rises and then becomes constant (d) does not rise at all

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Solution

option d is the correct answer.

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.

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