Question

(a) Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ?
(b) Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.

Answer 1

(a) Latent heat of vaporisation of a liquid is the quantity of heat in joules required to convert 1 kilogram of the liquid at its boiling point to gas or vapour, without any change in temperature.
The latent heat of vaporisation of water is 22.5 × 10⁵ J/kg.

(b) The diagram below shows the experiment set up to study the latent heat of vaporisation of water.

atent heat of vaporisation