A student investigates how the pressure of a fixed mass of air changes when its volume changes. The temperature of the air stays the same.
The air is trapped in a sealed syringe connected to a pressure gauge.
The Table shows the results.
Table
| Volume in cm3\text{cm}^{3}cm3 | Pressure in kPa\text{kPa}kPa |
|---|---|
| 50 | 100 |
| 40 | 125 |
| 25 | |
| 20 | 250 |
State the independent variable in this investigation.
Calculate the pressure of the air when the volume is 25 cm3.
Use the equation
P1×V1=P2×V2P_1 \times V_1 = P_2 \times V_2P1×V1=P2×V2
Describe the relationship between the pressure and the volume of the air.
Use data from the Table in your answer.
The student pushes the plunger in slowly and waits before taking each reading.
Explain why.
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.