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States of Matter
Understand how solids, liquids, and gases differ in shape, volume, and compressibility.
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Core Idea
Particles in solids are closely packed, liquids have looser packing, and gases move freely.
These differences explain why gases are compressible while solids are not.
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Go to PracticeTopic Q&A
Why do gases fill the whole container?
Gas particles move randomly with weak intermolecular forces, so they spread out and occupy all available space.
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