Physics · KS3 Y8 · Forces & Motion
Atmospheric pressure
p30Free3:12Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- The atmosphere is a layer of air, mostly nitrogen and oxygen, held around the Earth by gravity.
- Air pressure is caused by air particles colliding with surfaces.
- Pressure falls with altitude because there is less air above pushing down and the air is less dense.
- At high altitude each breath holds fewer oxygen particles, which makes breathing harder.
In this clip
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.2/7, 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.
Our students
How the Heddy Score worksNot enough students yet
Our own students' answers. These are what move ★7 Proven.Why we picked it
Cognito lesson on atmospheric pressure and why it falls with height; found in the Geography sheet but is Physics (GCSE triple, also fits Year 8).
Cognito on YouTubechecked 2026-10-16