Lesson 8: Correct Ideas about Atoms
When you have a cup of hot water in a cup, the uppermost part of the liquid cools against the cool air, as it cools, it sinks. Then hot molecules float to the top, the cool, and sink. This leads to the water molecules going in a circular fashion. If you put pepper into a cup of hot water, you will see the pepper moving in a circle up and down as the pepper pushes the water out of the way. Also, molecules in hot water have more energy. There are three ways that a thing can be: solid, liquid, and gas. Gas molecules have the most motion, liquid molecules move around slowly or fast, and solid molecules just wiggle.
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