Temperature is connected with the particles' average kinetic energy. Heat is energy transferred because of a temperature difference, not a substance hidden inside an object. In this constant-volume gas model, warming increases typical speed while count remains fixed. It does not include melting, boiling or chemical reactions, which can involve additional energy changes.
Matter and chemistry · Discover & try
What changes when particles are heated?
Reading level 3 of 5 · IndependentChange
Word help
temperature
A measure related to particles’ average kinetic energy.
heat
Energy transfer caused by a temperature difference.
Watch · Try · Explain
See how it works
The interactive activity is loading.
Idealised fixed-volume gas; motion is slowed and no actual heating experiment is required.
What to look for
- Count stays fixed
- A range of speeds remains
- Cooling reduces average motion
Explain what you noticed
A sealed sample is cooled without losing material. Which change fits this model?
Keep this idea: Compare average motion without inventing extra particles.
Follow the sources
- American Chemical Society — Molecules in Motion
- American Chemical Society — Heat, Temperature, and Conduction
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
Keep following the idea
Next discovery →