A group of physics students investigate Boyle's Law by measuring how the pressure of a fixed mass of gas in a sealed syringe varies with its volume at a constant temperature.
The students change the volume of the gas using the plunger of the syringe and record the corresponding pressure using an analogue pressure gauge connected to the nozzle.
The graph of the students' results is shown below:
a.[3]
Describe the trend shown by the graph. Use data from the graph in your answer.
b.[4]
Suggest how the students could improve the accuracy and precision of their results.