What you'll learn
The particle model and pressure.
Key ideas
- Density = mass ÷ volume; states of matter and changes of state.
- Pressure = force ÷ area; gas pressure and temperature/volume.
Exam tips
- Rearrange density and pressure correctly.
- Explain gas pressure with particle collisions.
Common mistakes
- Confusing mass and weight.
- Confusing force and pressure.