Materials Required A plastic container Water, Cooking Oil Refrigerator for freezing How to do it Pour water into the clear plastic container. Pour some some cooking oil into the container. Leave this for a few minutes to settle down. The oil will rise to the top of the container because ,the oil is lighter than the water. Now keep the container into the freezer for a few hours. Remove the container from the freezer and observe. The oil is now below the water. Explain to the child that this is because Water becomes solid when freezing. The water expands when it frozen and becomes less dense than that of the oil. This makes the water to rise to the top. What is learnt The density of substance varies with temperature.
How to do it
What is learnt