Pour one-third cup of syrup into a glass jar followed by one-third cup of cooking oil. Then pour in one-third cup of water. Drop in a piece of plastic, followed by a grape, followed by a small cork. See what happens.
You will notice that the different liquids stacks up in layers. This is because the liquids have different densities. The most dense (syrup) will be at the bottom, the least dense (oil) will be at the top, with the water in between. Each object will sink to the level of the liquid that has a greater density than the object. The object will then float on that layer.
Density is defined as the ratio of the mass of an object to its volume
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