Physics · KS3 Y7 · Matter & Particles

The particle model of matter

p62Free1:26Heddy Score 2 of 7, below the standard

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What you need to know

  • In a solid the particles are close together in a regular pattern.
  • In a liquid they are close but jumbled; in a gas they are far apart.

In this clip

0:00–1:26The particle model of matterp62
1:26–3:09Calculating densityp70
Also coversDensity: how tightly matter packsp69
Heddy Score2/7, Below the standard
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · not judged yet. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
How the Heddy Score works

Why we picked it

Freesciencelessons lesson linking the particle model to density and its calculation; GCSE, suits Year 8 to 9.

Freesciencelessons on YouTubechecked 2026-10-16