Homework → Science → Chemistry → Solids, Liquids and Gases

1. Solids melt to form liquid and then evaporate to form gas.
2. Gases condense to form liquid and Freeze to form solid.

A solid has particles that vibrate about a fixed position. It has a constant mass, volume and shape.	A liquid contains particles that move around more freely. It has a constant mass and volume but changes shape.	A gas contains particles that move around at great speed. It has a fixed mass but changes in volume and shape.

• Solids - Often strong, hard to compress, have a fixed shape, have particles in regular patterns that are closely packed and strongly bonded (linked together).
• Liquids - Little strength, spread out to fill any container, only mix slowly, have particles weakly held together, widely spread apart.
• Gases - Easily compressed, have no strength, no fixed shape, mix quite easily, spread out quickly, its particles are widely spread apart and sometimes bump into each other. They are freely moving.

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