Why do objects that are the same size sometimes have different weights? The answer has to do with their density. An object's density is determined by comparing its mass to its volume. If you compare a rock and a cork that are the same size (they have equal volume), which is heavier? The rock is, because it has more mass. The rock is denser than the cork, then, because it has more mass in the same volume - this is due to the atomic structure of the elements, molecules, and compounds that make it up.
Liquids have density, too. We experimented with corn syrup, water, oil, paint and dish soap to determine which is more dense.... Ask your child what liquid sank to the bottom... which floated on the top?
Thank you, Dr. Rosler!
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