Chemistry › Section I · Gases › Topic I.2
The gas laws and the ideal gas law
Squeeze a gas, heat it or add more of it, and its pressure, volume and temperature change in predictable ways. Four simple laws describe those changes, and they combine into one equation, PV = nRT, that works for almost any gas under everyday conditions.
In this topic
- Four variables describe a gas
- Pressure and temperature: Amontons's law
- Worked example: a warm tyre
- Volume and temperature: Charles's law
- Pressure and volume: Boyle's law
- Amount and volume: Avogadro's law
- The ideal gas law
- Worked example: oxygen in a cylinder
- The combined gas law and molar volume
- Worked example: a rising balloon
- Common mistakes to avoid
- Key takeaways
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