Chemistry › Section I · Gases › Topic I.4
Effusion and diffusion
Gas molecules never stop moving, so gases spread out and leak through the smallest gaps. How fast they do it depends on how heavy their molecules are, a relationship simple enough to identify an unknown gas and important enough to have shaped the nuclear industry.
In this topic
- Gases on the move
- Diffusion
- Why diffusion is slow
- Effusion
- Graham's law
- Worked example: a helium balloon
- Rates, times and molar masses
- Worked example: identifying a gas
- Separating uranium isotopes
- Common mistakes to avoid
- Key takeaways
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