Physics at the University of Virginia
Academics People Research Announcements Facilities Adminstration Home Updates

Return to Demo Lab Homepage

Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

Choose a Topic or Enter a keyword to search:
I cannot find what I want!

You have selected the following Demos:
  • None Selected

Choose a subtopic:
(Clicking a green button will add that demo to your list)
 Thermal Properties Of Matter
 Heat And The First Law
 Change Of State
 Kinetic Theory
 Gas Law
 Boyle's Law
 Ideal Gas Law
 Entropy And The Second Law

Boyle's Law


To demonstrate that pressure times volume in a closed gaseous system is constant if the temperature remains unchanged.


Calibrate the unit by releasing the quick disconnect valve from the pressure gauge and setting the syringe at '0' cc. Connect the pressure gauge and pull the syringe out until the pressure reads half of what it read with the gauge disconnected. The volume now read on the syringe is the volume of the gauge, valve, and tube and must be added to all volume readings to insure accuracy. Again release the valve and pull the syringe out to about 20 cc. and reconnect the valve. Increase and decrease the volume and record the pressures at each setting. The constant can then be calculated.


Note: 1 ATM = 14.7 psi

As of 11apr2014, the volume outside the syringe is 6 cc.

It might be helpful before each new measurement to "reinitialize" the syringe at 20 cc by removing quick disconnect and verify ATM = 14.7 psi.


  • Boyle's Law Apparatus
  • Overhead Projector