All things, including water, can be measured in density. Density is how much stuff is packed into the same amount of space. So a cup of water compared with a cup of honey — which is more dense? It's the gloopy, thick honey.
Solid things, including your bones, can be measured in density. Nice, solid bones will be strong, less likely to break, and have high bone density. If you get enough calcium when you're young, your bones are more likely to be dense and strong for your whole life. So drink milk and eat other calcium-rich foods!
But back to our density rainbow: Plain water is less dense than water mixed with other stuff, such as dissolved candy (sugar). In this experiment, you'll dissolve small and large amounts of candy into water. Then you can carefully layer the different-colored waters in a glass.
The water that contains only two dissolved candies will float on top of the water mixtures that contain four, six, eight, and 10 dissolved candies. Why? The water mixtures that are less dense (fewer candies) will float on top of the layers that are more dense (more candies).
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© Loralee Leavitt. Used with permission.
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Reviewed by: Mary L. Gavin, MD
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