Lesson 1.2: Molecules in Motion

Interactive
Heating and Cooling a Liquid

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• The molecules in cold water move slowly and are close together.
• As the water is heated, the molecules move faster and a little further apart.

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Water Molecules at Different Temperatures

• The circles represent water molecules.
• The molecules are randomly arranged.
• They interact with each other because of their attractions.
• The motion lines show that they are moving.