A researcher uses a sensor to monitor the pressure of a sample of neon gas inside a rigid, constant-volume canister.
The sensor measures pressure in pascals (Pa\text{Pa}Pa). Which of the following units is equivalent to the pascal?
A. J⋅m−1\text{J}\cdot\text{m}^{-1}J⋅m−1 B. J⋅m−3\text{J}\cdot\text{m}^{-3}J⋅m−3 C. W⋅m−2\text{W}\cdot\text{m}^{-2}W⋅m−2 D. kg⋅m⋅s−1\text{kg}\cdot\text{m}\cdot\text{s}^{-1}kg⋅m⋅s−1
The canister is then immersed in a cryogenic liquid bath, causing the temperature of the gas to drop. The pressure of the neon gas inside the canister decreases.
Explain why the pressure of the gas decreases. Use ideas about molecules and their kinetic energy in your answer.
51 exam-style questions on Edexcel IGCSE Physics Ideal gas molecules. Each one has a worked solution and a mark scheme showing where the marks go.