The Kelvin temperature scale and absolute zero, Boyle’s law, Charles’ law, the pressure law and the general gas law, with kinetic-theory explanations and worked calculations.
5 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
A car tyre is checked cold because after a long journey the gas inside is hotter, and its pressure is higher. The gas laws explain how much.
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Change the temperature and the volume of a gas and watch how the pressure changes.
Copy these into your notebook in your own words — that is how they stick.
−273 °C = 0 K: the temperature at which the extrapolated volume/pressure would be zero.
T/K = θ/°C + 273.
Fixed mass, constant T: PV = constant.
Fixed mass, constant P: V/T = constant (K).
Fixed mass, constant V: P/T = constant (K).
P₁V₁/T₁ = P₂V₂/T₂.
Use kelvin for T in Charles, pressure and general gas law.
Gas pressure is due to molecular collisions with the container walls.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Physics Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (16 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [16 marks]
A sealed container holds a fixed mass of gas at a pressure of 150 kPa and a temperature of 27 °C. A calculator may be used.
(a) (a) Convert 27 °C to kelvin. [1]
(b) (b) The container is heated at constant volume to 87 °C. State the law that applies, and calculate the new pressure. [5]
(c) (c) Use the kinetic theory to explain why the pressure increases. [3]
(d) (d) The gas is then compressed at constant temperature from 600 cm³ to 400 cm³. Calculate the new pressure of the gas from 180 kPa. [3]
(e) (e) State Boyle’s law. [2]
(f) (f) A volume–temperature graph for a gas is extended back to zero volume. State the temperature at which it reaches zero and its name. [2]
Find these in your own past-paper booklets for extra timed practice. Items above are written in the style of these papers; any adapted from a specific question say so.