(1) Take a few pieces of ice in a glass beaker as shown in figure.

(2) Insert the bulb of a thermometer in ice and measure its temperature.
(3) Put the beaker on a stand and heat the ice using a burner.
(4) Record the temperature using the thermometer after every minute.
(5) As the ice is heated,it starts melting. Stir the mixture of ice and water.
(6) Continue the heating even after ice starts melting.
(7) Draw a graph of temperature versus time.

Define latent heat of fusion
OR
What is latent heat of fusion ? State its units.

Explanation

When a solid is converted into liquid at constant temperature ( melting point of the substance ) the amount of heat absorbed by it is called the latent heat of fusion.
Heat is a form of energy.Hence, latent heat is expressed in units joule , erg, calorie or kilocalorie.