Science · Class 5–9

States of Matter

Watch how the same particles arrange themselves in solids, liquids and gases — and what happens when you heat them.

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🧠 Remember it

States of Matter

Solid–Liquid–Gas = particles packed tight → loose → free. "Solids Stay, Liquids Loosen, Gases Go anywhere." More heat = more particle movement.

🌏 In real life

Ice in your glass melts to water on a hot day, and a boiling kettle sends out steam — the same water, just its particles gaining energy and spreading out.

📝 Quick notes

  • Solid: particles closely packed in fixed positions → fixed shape and volume.
  • Liquid: particles close but able to slide → fixed volume, takes the container's shape.
  • Gas: particles far apart and moving freely → no fixed shape or volume, fills any space.
  • Heating increases particle energy and movement; cooling decreases it.

🎯 Test yourself

Why does a gas have no fixed shape?

Its particles are far apart and move freely, so it spreads to fill any container.

Learn it fully — free

See the animated, step-by-step States of Matter lesson on Syllab

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