Relationship between Boyle’s law Pressure and Volume

Pressure - Volume (P-V) relation of a gas When studying the behaviour of gases, there are three quantities to consider: Pressure Volume Temperature

Boyle’s Law The following apparatus is used to investigate how the pressure of a fixed mass of air varies with its volume when the temperature is kept constant.

Procedure 1. Pressure is increased by applying the foot-pump 2. Volume of air is read from the scale 3. Pressure is measured by a Bourdon gauge 4. Several pairs of readings of pressure and volume are taken

Experiment: Studying the variation of volume with pressure

Result

Volume Pressure The volume of a fixed mass of gas at a constant temperature is inversely proportional to the pressure.

Result

Graph Plotting

Conclusion P  1/V PV = constant P 1 V 1 = P 2 V 2 Boyle’s Law Pressure of a fixed mass of gas at constant temperature is inversely proportional to its volume

Pressure & Volume §P V = constant §P1 §P1 V1 V1 = eg. 20 x 27 = 540 §P2 §P2 V2 V2 = constant eg. 30 x 18 = 540 §P1 §P1 V1 V1 = P2 P2 V2 V2 = P3 P3 V3V3