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Education Concept Tracker

A prerequisite knowledge graph of 1590 learning concepts across 8subjects. Track what you've mastered and see exactly what you're ready to learn next — the topics whose prerequisites you've already met. Built on the Marble Open Skill Taxonomy.

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Solids, Liquids & Gases

Science · Matter & Materials · conceptual

Compare and group materials as solids, liquids, or gases based on their observable properties and behaviour

What mastery looks like

  • Define solids (fixed shape, hard to compress), liquids (flow, take shape of container), gases (spread out, fill space)
  • Sort at least eight everyday materials into solid, liquid, or gas categories
  • Explain tricky cases like sand (solid particles) or steam (gas, not visible water droplets)

Check your understanding

Can Solids, Liquids & Gases explain the difference between a solid like ice, a liquid like water, and a gas like steam, and sort everyday things into these three groups?