Prove that liquids can float on other liquids. Demonstrate that solids may sink in some liquids but float in others.
Some liquids can also float on other liquids, forming layers.
Perhaps you have seen such liquid layers in bottles of Italian salad dressing. Well, this has to do with density, or how heavy something is compared to its volume. Volume is the amount of space an object or substance takes up. Objects that are the same size can have different densities and so can different liquids. Liquids that are made of different elements have different densities.