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GCSE Combined Science · key term
A state of matter with a fixed volume but no fixed shape; its particles are close together and can move past one another.
Used by AQA and OCR
Specification 4.1.1.1 · Paper 1, Paper 2
Revise: Particle ModelIn a flat diagram, we draw circles instead. This simplified picture helps connect things we can observe—such as a liquid flowing—to the arrangement and movement of particles we cannot see directly.
Specification C1.1a · Chemistry Paper 1
A state of matter with a fixed volume but no fixed shape; its closely spaced particles move past one another.
Distinguish evaporation at the surface from boiling throughout a liquid.
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A solid ice cube, liquid water and water vapour are different states of the same substance. The particle model explains these states by representing matter as tiny particles. In diagrams, we usually draw the particles as circles or small spheres.
