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Boyle’s Law With Probe Technology

Purpose: to demonstrate and observe Boyle’s law and the indirect relationship between pressure and volume.

Introduction:  As you know, the relationship between the pressure and volume of a gas is an indirect relationship.  If all other conditions remain the same, as the pressure of a gas goes up, its volume inversely decreases.  If the pressure of a gas goes down, it volume inversely increases.  This relationship was first discovered by a scientist named Robert Boyle, in the 1600's.  Due to his intensive studies of this inverse relationship, the law was named Boyle's Law.  Boyle's Law states:

At a constant temperature, the volume of a confined ideal gas varies inversely with its pressure.

Materials: Plastic syringe, valve, tubing, pressure adapter, Data Harvest Measurement Reader, computer, serial cord.

Procedure:

1. Connect all measuring instruments: a. Connect measurement reader to computer by connecting the serial cord to the comp1 port. b. Plug pressure adapter to the measurement reader in the slot marked “1”.  c. Connect pressure adapter, with tubing, to valve, which should be connected to the syringe.
2. Turn on computer, open Data Harvest Graph Program.  Open new graph, and select snapshot mode.
3. Make sure the syringe is plugged in the right spot (opposite the tubing). Allow air to enter the syringe.  Begin with the syringe at 1 cc. Measure how much pressure is in the syringe by clicking.  Pull the syringe to 2 cc. Measure the pressure again. Continue until enough you reach the end of the syringe. Record all data and prepare a line graph using Excel.

Observations:

As the volume increased, the pressure readings decreased.

Data:

Volume (cc)

Pressure (kPa)

1

98.8

2

76.6

3

67.8

4

56.9

5

52.2

6

49.3

7

45.3

8

42.9

9

40.2

10

38.5

11

37.0

Conclusion