Physics · KS3 Y8 · Energy
Thermal radiation
p17Free3:27Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- All objects give out and take in infrared radiation; hotter objects give out more.
- Matt black surfaces are the best emitters and absorbers of infrared; shiny silver surfaces are the poorest.
- A Leslie cube filled with hot water compares how much infrared different surfaces give out.
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
Freesciencelessons walk-through of the GCSE infrared required practical with a Leslie cube; linked to the KS3 thermal radiation topic.
Freesciencelessons on YouTubechecked 2026-10-16