Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
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.
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Purpose:To demonstrate that pressure times volume in a closed gaseous system is constant if the temperature remains unchanged.
Procedure: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.
Hints: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.