In a solid, molecules are packed together, and it keeps its shape.Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.
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Describe a liquid
Liquid matter is made of more loosely packed particles. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained.
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Describe a gas.
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed.
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