Gas particles collide elastically with each other and the walls. Use sliders to adjust number of particles and temperature. Width/height sliders act as volume controls.

Pressure, Temperature and Volume:

• Pressure: Force per unit wall length, estimated from wall impulse per unit time.
• Temperature: Average kinetic energy of the particles.
• Volume: Available space (box area) for the particles.

Try looking for:

• Boyle's Law: keep T fixed, reduce width or height — pressure rises.
• Charles's Law: keep area fixed, increase T — pressure rises.

Tip: Wait a few seconds after changing a slider for pressure to stabilise.