Heating can give particles more energy of motion. In the same material, a hotter sample usually has faster-moving particles on average. That does not mean every particle has the same speed. Here the container and particle count stay fixed, so you can focus on motion rather than particles appearing or growing.
Matter and chemistry · Discover & try
What changes when particles are heated?
Reading level 1 of 5 · EarlyChange
Word help
temperature
A measure related to particles’ average kinetic energy.
heat
Energy transfer caused by a temperature difference.
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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.
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