A computer model tracks a fixed number of gas particles in a rigid box at temperatures of −200 ∘C-200\,^\circ\mathrm{C}−200∘C, −273 ∘C-273\,^\circ\mathrm{C}−273∘C and −300 ∘C-300\,^\circ\mathrm{C}−300∘C. The model predicts whether collisions of the particles with the box produce positive, zero or negative pressure.
Which prediction is consistent with the simple particle model?
At −300 ∘C-300\,^\circ\mathrm{C}−300∘C, the pressure is negative because the particles have less than zero kinetic energy.
At −273 ∘C-273\,^\circ\mathrm{C}−273∘C, the pressure is zero because the particles no longer collide with the walls.
At −200 ∘C-200\,^\circ\mathrm{C}−200∘C, the pressure acts only on the base because the cooled particles move downwards.
At −273 ∘C-273\,^\circ\mathrm{C}−273∘C, the pressure equals that at −200 ∘C-200\,^\circ\mathrm{C}−200∘C because the volume is unchanged.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.