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GCSE Physics · key term
A simplified scientific representation in which matter consists of extremely small particles, such as atoms or molecules, with empty space between them.
Used by AQA, Edexcel and OCR
Specification 4.3.1.1 · Paper 1
A simplified scientific representation in which matter is treated as particles, such as atoms or molecules.
Revise: Density and the Particle ModelThe particle model treats matter as being made from tiny particles, which may be atoms or molecules. It is a model: the circles used in a drawing are not life-sized pictures, but they help us represent particle arrangement and movement.
Specification 14.1 · Paper 2
A simplified representation in which matter consists of tiny particles; their arrangement and movement are used to explain observable properties.
Revise: Kinetic Theory ModelKinetic theory uses a simple particle model to explain why these states behave differently. It represents a substance as tiny particles that are always moving: the word kinetic refers to movement.
Specification P1.3a · Paper 1 (Foundation), Paper 3 (Higher)
A model in which gas molecules move rapidly and randomly, with forces arising when they collide with surfaces or one another.
Paper 1, Paper 2
Revise: Density and Mass in the Particle ModelThe particle model represents every substance as extremely small particles—atoms or molecules. There is no other matter between the particles. Particles of one pure substance are alike, while particles of different substances can have different masses.
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