Name: Evan Haas Period: 5/6
Date: 11/15/99

Lab 5: Boyle's Law

Purpose: The purpose of this lab is was to demonstrate Boyle's Law, which states that Pressure and Volume vary inversely if temperature is held constant.


  1. Data Logger
  2. Pressure sensor
  3. Syringe


Volume (mL) Pressure (atm)
6 1.68
7 1.47
8 1.3
9 1.18
10 1.06
11 .96
12 .88
13 .81
14 .75
15 .7

This graph shows that Pressure and Volume are inversely related. The constant, 9.59, is equal to nRT, or the number of moles of gas * Universal gas constant * Temperature of the room.

Conclusion: The goal of this lab was to verify Boyle's law, which states that the pressure and volume of a gas are inversely related when temperature is constant. We assumed that room temperature would remain constant for the duration of the experiment.

First set up the pressure sensor and syringe, and record the volume of the gas when the pressure is 1 atmosphere. Then decrease the volume to 6 mL in increments of 1 mL, recording the pressure at each interval. Next return the volume to its original state and increase the volume to 15 mL in increments of 1 mL, again recording the pressure at each interval.

The results of this lab were consistent with Boyle's law. As predicted, the graph was inverse, and our constant was 9.56.

The main source of error in this lab was inaccuracy in reading the syringe. This is random error; sometimes we were a little high and sometimes a little low, as seen in our graph. There are also slight inaccuracies in the Data Logger, which rounds numbers to two decimal places. To correct for misreadings of the syringe, we could do more trials or use a more finely divided syringe.

Our experiment verified Boyle's law - pressure and volume vary inversely when temperature is constant. One way to improve the lab would be to perform more trials to improve our accuracy and help get rid of some of our random error.

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