March 2005
Robert
Boyle was the first to publish the relationship between pressure and volume for
a constant amount of gas held at a constant temperature.
This
relationship if often stated as P ~ 1/V or PV = constant. The ideal gas law gives this constant as nRT
where n is the number of moles, T temperature in Kelvin, and R is the universal
gas constant 8.315 J/(mol K).
Equipment:
Vernier LabPro
Vernier LabPro power supply
USB cable to cable LabPro to PC
Vernier Pressure Sensor PS-DIN with
DIN-BTA adapter
(NOTE: DO NOT use Biology Gas sensor BGP-DIN)
20 cc syringe
LoggerPro Software installed on PC
BoylesLaw.MLB experiment file http://members.cox.net/gilvick
This
demo is run using the Logger Pro software package. Open the experiment BoylesLaw found on the physics web page
above.
Run
4 separate demos with initial conditions of 20, 15, 10, & 5 cm taking data
at 20, 15, 10, & 5 cm.
Using
the ‘Data’ tab ‘Store Latest Run’ and ‘Rename Run’ to reflect the starting
volume of each run.
Using
the ‘Data’ tab sort on volume.
Consider:
Compute n for the air in the syringe
for each run.
Run the logger P analysis “inverse”
and comment on the constant WRT the calculated PV.
Would this experiment work the same way
with a larger syringe?
The 20 cc syringe has a diameter of 2
cm. Could you do this experiment with a
syringe with a 6 cm diameter?