Heat energy can be transferred by convection when there are temperature differences between two parts of a liquid.

The formation of convective currents can be demonstrated by the following experiment

Required: Beaker, water, Potassium permanganate VII, Bunsen burner Potassium Permanganate (VII) is a colored compound that dissolved in water on heating.

Procedure: Take water in a beaker and put potassium permanganate VII into it and put the contents of the beaker to heat on a Bunsen burner. This chemical compound will dissolve slowly in water and the movement of this colored compound will be visible thus showing the formation of convective currents.