Particles moving at random, what pressure is, why a hotter gas in a sealed container has a higher pressure, and the kelvin scale.
What you will learn
- Explain gas pressure in terms of particle collisions
- Explain why pressure rises with temperature at constant volume
- Convert between °C and kelvin
Pressure from collisions
The particles in a gas move constantly in random directions at a range of speeds.
Each time one hits a wall it exerts a small force. Pressure is the total force of all these collisions on each unit of area.
The temperature of a gas is linked to the average kinetic energy of its particles: hotter means faster on average.
The rest of this lesson and its 7 practice questions are locked.
In this lesson
- Pressure from collisions
- Heat a sealed gas
- The kelvin scale
- Try it: Watch the particles
7 practice questions, marked as you go; about 20 minutes in all.
Key terms
Temperature, Absolute zero
In this unit: Particle model, density and gas pressure
Density and its required practical, changes of state, specific latent heat, and the particle model of gas pressure, including p₁V₁ = p₂V₂.