Did you know the ancient Greeks first identified the three states of matter? Read about how the molecules differ in solids, liquids, gases, and plasma. View photographs and watch how the molecules move in each state. If you're really interested, read about a recently discovered fifth state of matter!

Concepts

molecular motion, plasma

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Additional Tags

gas, states matter, liquid, solid

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Classroom Considerations

• Knovation Readability Score: 5 (1 low difficulty, 5 high difficulty)