IGCSE Physics / Solids, liquids and gases

Pressure and volume of a gas revision notes

Edexcel International GCSE Physics (4PH1), chapter 19: Solids, liquids and gases, specification point 5.20, 5.22. Part of the full course.

Watch the video lesson · IGCSE Physics past papers

For a fixed mass of gas at constant temperature, pressure and volume change in opposite directions. The relationship p₁V₁ = p₂V₂ lets you calculate the new pressure or volume, then check whether the answer makes sense.

More lessons in Solids, liquids and gases

• Particles in solids, liquids and gases
• Changes of state: melting, evaporating and boiling
• Practical: a temperature-time graph for a change of state
• Specific heat capacity
• Practical: measuring specific heat capacity
• Gas pressure and molecules
• Absolute zero and the Kelvin scale
• Temperature and the speed of gas molecules
• Pressure and temperature of a gas