Question

As time passes, thermal energy (heat) is constantly supplied to the water but its temperature remains at 100 °C

Explain, in terms of the water molecules, what happens to the thermal energy supplied to the water as it boils.

Answer 1

the temperature remains constant at the boiling point as some amount of heat is required by the water molecular to increase its potential energy and thus changing its state to water vapour. this energy is not manifested in terms of change in temperature and hence called specific latent of vaporization which is approximately 2268 kJ.