How can you tell they’ve got it: The Particle Model?

If they’ve got it, you’ll see things like: Draws particle diagrams for solids, liquids, and gases showing correct arrangement and spacing; Explains why gases are compressible but liquids and solids are not; Explains why ice floats on water using the anomalous expansion of water; Uses particle spacing to explain why gases are much less dense than solids and liquids. Or just try it together: If your child was asked why you can squash a balloon but not a water bottle full of liquid, could they explain using the idea of particles what's different about gases and liquids?

Science Matter & Materials Ages 11–12

The Particle Model

Your child can explain why you can squash a balloon but not a full water bottle. In a gas the tiny bits are far apart, so they can be pushed closer. In liquid they cannot.

In curriculum terms

Use the particle model to explain the properties of solids, liquids, and gases — including differences in arrangement, movement, and spacing — and apply the model to explain density, compressibility, and the anomalous expansion of water

Ages are typical, not deadlines — follow your child’s pace. How to help at home →

How to tell they’ve got it

Tick these off as you see them — no test required.

Draws particle diagrams for solids, liquids, and gases showing correct arrangement and spacing
Explains why gases are compressible but liquids and solids are not
Explains why ice floats on water using the anomalous expansion of water
Uses particle spacing to explain why gases are much less dense than solids and liquids

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Try this together

If your child was asked why you can squash a balloon but not a water bottle full of liquid, could they explain using the idea of particles what's different about gases and liquids?

Where this sits on the map

Stuck here? Check the skills it builds on first. Confident? Here’s what it unlocks.

Builds on

Drawing Particle Diagramsages 7–11Using the particle model to explain density, compressibility, and anomalous expansion requires fluent reading and drawing of particle diagrams

Solids, Liquids & Gasesages 8–9KS3 particle model extends KS2 classification of solids, liquids and gases by observable properties

Matter Is Made of Particlesages 10–11KS3 particle model extends US KS2 introduction to matter as particles too small to see

The Particle Modelthis skill · ages 11–12

Unlocks

Atoms, Elements & Compoundsages 11–12Atoms and molecules are the particles referred to in the particle model — builds directly on it

How Materials Change Stateages 11–12Changes of state are explained using the particle model — the particle model must be understood first

Physical vs Chemical Changesages 11–13The distinction between physical and chemical change is clearest at the particle level

Conduction, convection, and radiationages 12–13Explaining conduction and convection at the particle level requires knowing the particle model of matter

solid = must come firstdashed = helps

Curriculum alignment

Where this fits in the official school curriculum — our best automated guess, not yet checked by a person.

Show candidate curriculum codes · 2 ACARA · 1 VIC

Australian Curriculum v9 candidate

AC9S6I04low confidenceYear 6 · Science inquiry

construct and use appropriate representations, including tables, graphs and visual or physical models, to organise and process data and information and describe patterns, trends and relationships

AC9S5I04low confidenceYear 5 · Science inquiry

construct and use appropriate representations, including tables, graphs and visual or physical models, to organise and process data and information and describe patterns, trends and relationships

Victorian Curriculum 2.0 codes & levels only

VC2S6U03high confidenceScience · Levels 5 and 6 · Science Understanding strand

These are candidate alignments generated by semantic matching — machine-suggested and unreviewed (v0.1), not official or verified mappings. For official curriculum content see australiancurriculum.edu.au, curriculum.nsw.edu.au and f10.vcaa.vic.edu.au. Don’t rely on them for registration or compliance purposes.

Nearby on the map

Atoms, Elements & Compoundsages 11–12 How Materials Change Stateages 11–12 Metals vs Non-Metalsages 11–13 Physical vs Chemical Changesages 11–13

All Matter & Materials skills →