012-06014C Heat Engine/Gas Law Apparatus
7
®
Experiment 3: Boyle’s Law
Theory
Boyle’s law states that the product of the volume of a gas times its pressure is a constant at a fixed
temperature:
=
a
V
➀ With the platform raised to its uppermost posi-
tion, connect the Pressure Sensor to a port on the
base apparatus with a short piece of tubing
(Figure 3.1).
➁ Close the shut-off valve on the tubing from the
unused port.
➂ Connect the Pressure Sensor to the computer
interface and set up Science Workshop to record
pressure. Be sure that you set up the keyboard
sampling option so you can enter height data by
hand. (Consult the Science Workshop User’s
Guide, “Keyboard Sampling,” for details.)
Procedure
➀ Record the height of the piston and the pressure
when the platform is raised to its highest position.
➁ Press the platform down to a series of levels and
record the height and pressure at each level.
➂ Convert the height measurements to gas volume
measurements. (Hint:
The diameter of the piston is 32.5 mm.)
➃ Prepare a graph of pressure versus volume.
Therefore, at a fixed temperature, the pressure will be inversely related to the volume, and the
relationship will be linear:
*For details on setting up and operating the Pressure Sensor with Science Workshop, please
consult the instruction sheet for the Pressure Sensor and the User’s Guide for Science Workshop.
PV = a
Setup
➤ Note: The relationship between pressure and volume may not be linear at pressures greater
than 120 kPa because of air leakage from the valves and ports at higher pressures.
Figure 3.1. Experimental setup
HEAT ENGINE
GAS LAW APPARATUS
Piston Dia.:
32.5mm±0.1
TD-8572
CAUTION:
Max. Pres.: 345kPa. Use Gases Only
DO NOT
Immerse in any Liquid
DO NOT Lubricate Piston or Cylinder
Pressure Port Mating Connector:
PASCO Part No. 640-021
Piston&Platform
Mass:
35.0g±0.6
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CI-6532
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to computer interface
Close the shut-off
valve on the tubing
from the unused
port.
Pressure Sensor
Equipment Required:
• Heat Engine/Gas Law Apparatus
• Pressure Sensor (CI-6532)
• Science
Workshop computer interface*
(7 pages)
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