Boyle's Law

Carlos Rodriguez

What you need to know

To perform the Boyle's Law lab, you need to know the following information. We will be determining the relationship between pressure and volume of a confined gas. Using air trapped in a syringe and connected to a gas pressure senor, we will determine the pressure of the gas when the volume changes. This relationship first established by Robert Boyle in 1662 and is called Boyle's law

What you will need

  • Computer
  • Vernier Gas Pressure Sensor
  • Vernier Computer Interface
  • Logger Pro
  • 20 mL Gas Syringe


1. Prepare the Gas Pressure Sensor and an air sample
  • Plug the Gas Pressure Sensor into the computer interface
  • With the syringe disconnected, move the piston until the 10 mL mark
  • Attach the syringe to the valve of the Gas Pressure Sensor

2. Open the file "06 Boyle's Law" from the chemistry with computers folder of Logger Pro

3. Correct volume readings from the syringe

  • To account for the extra volume, add 0.8 mL to your syringe readings

4. Click "Collect"

5. Collect the pressure vs. volume data

  • Move the piston to the 5.0 mL line on the syringe. Hold firmly until stable
  • When pressure is stable, click "Keep". Type in the total gas volume (5.8 mL) in the edit box
  • Move piston to the 7.0 mL line. when pressure is stable, click "Keep". Type in 7.8 for total volume
  • Continue this procedure for all volumes
  • Click "Stop when finished

6. Record data displayed in the table

7. Examine graph, decide what kind of relationship exists between pressure and volume (direct or inverse).

  • Click the Curve Fit button
  • Choose variable power (y=Ax^n) from the list. Enter the power value ,n, in the power edit box. 1 if direct, -1 if inverse. Click "try fit"
  • A best fit curve will be displayed on the graph. If you made the correct choice, the curve should match up with the points.

8. Print a copy of the graph

9. Proceed directly to the processing the Data section


I noticed that as the volume increased, the pressure decreased. This is an inverse relationship.
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In conclusion, I discovered that the relationship of pressure and volume is inversely proportional. As the Volume of the container increases, the pressure decreases. The pressure * the volume = the constant k. The same substance under different conditions can be written as PV=PV