A fixed mass of gas is heated at constant volume - AQA - A-Level Physics - Question 9 - 2021 - Paper 2

In the context of the problem, where a fixed mass of gas is heated at constant volume, the graph presented is a linear relationship that typically represents the relationship between temperature and pressure.

Analysis of Options Given

• A: Pressure in Pa and temperature in °C
• B: Temperature in °C and pressure in Pa
• C: Pressure in Pa and temperature in K
• D: Temperature in K and pressure in Pa

Correct Answer

Given that, when heating a gas at constant volume, the pressure increases with temperature, we can infer that:

• x represents the pressure in Pascals (Pa) and
• y represents the temperature in Celsius (°C). Therefore, the correct choice is A.