Boyles law with the Vernier Go Direct Gas Pressure Sensor
The primary objective of this experiment is to determine the relationship between the pressure and volume of a confined gas. The gas we use will be air, and it will be confined in a syringe connected to a Gas Pressure Sensor. When the volume of the syringe is changed by moving the piston, a change occurs in the pressure exerted by the confined gas. This pressure change will be monitored using a Gas Pressure Sensor. It is assumed that temperature will be constant throughout the experiment. Pressure and volume data pairs will be collected during this experiment and then analysed. From the data and graph, you should be able to determine what kind of mathematical relationship exists between the pressure and volume of the confined gas. Historically, this relationship was first established by Robert Boyle in 1662 and has since been known as Boyle’s law.
- use ICT such as computer modelling, or data logger with a variety of sensors to collect data, or use of software to process data
- Investigation of Boyle’s law for a gas
In this experiment, you will
- Use a Gas Pressure Sensor and a gas syringe to measure the pressure of an air sample at several different volumes.
- Determine the relationship between pressure and volume of the gas.
- Describe the relationship between gas pressure and volume in a mathematical equation.
- Use the results to predict the pressure at other volumes.
On the Go Direct® Gas Pressure Sensor, press the power button once. The LED will blink red. Launch the Graphical Analysis App. Click Sensor Data Collection. Now select GDX-GP in the list (if you have more than one device, select the serial number corresponding to that on the case). The LED on the connected sensor(s) will now blink Green. Click DONE.
Select Mode from the bottom left of the graph screen. Change from Time Based to Event Based in the top of dialogue box. In the Event Name field type Volume, and in the Units field cm3. Leave the Average over 10 s switched off (white, not green).
You are now ready to collect data. First select Collect from the top of the graph screen: a graph and table are now displayed, along with Keep and Stop buttons. Tap on Keep and record the volume, which will be the starting position of the plunger (e.g. if you are using a 20 cm3plunger, this value will be 20); tap Done and the volume and pressure are recorded in the table. Now depress the plunger by 2 cm3 and tap Keep once again, keeping the plunger depressed. Record the new volume and tap Done. Repeat the process down to half the original volume of the syringe, or sooner if the point to which the syringe is depressed becomes uncomfortable to hold. When all readings are taken, tap Stop.