Physics · KS3 Y7 · Matter & Particles

Diffusion: particles spreading out

Diffusion: particles spreading outFree3:36Heddy Score 3 of 7, below the standard
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What you need to know

  • Gas particles are spread out and move quickly in random directions.
  • Diffusion is the spreading of particles from a region of high concentration to a region of low concentration.
  • Diffusion happens even in still air, without wind or stirring, which is why smells spread across a room.
  • Smells take time to spread because the particles keep colliding with air particles and changing direction.
Heddy Score3/7, Below the standard
See the seven stars
  • 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 · passed. 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.
On YouTube

394K views · 3.22K likes · FuseSchool - Global Education 933K subscribers

As reported by YouTube on 2026-11-01. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

Uses familiar smells to explain diffusion and why it takes time, all in terms of moving particles.

FuseSchool - Global Education on YouTubechecked 2026-10-22

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