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
 Ice Bomb (expansion of water upon freezing)
 Regelation in Ice
  video  - Thermocouple in Ice
  video  - Boiling by Cooling
  video  - Boiling by Reducing Pressure
  video  - Crush the Soda Can
 Sling Psychrometer (Relative Humidity)
 Phase Change in Iron
 Kinetic Theory
 Gas Law
 Entropy And The Second Law

 video  - Thermocouple in Ice


To demonstrate phase changes of water and the concept of latent heat.


centered image
centered image
  Pre-Checkout - DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 87MB size  

centered image
centered image
centered image
centered image
  Experiment - DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 105MB size  

A thermocouple (TC) is frozen in a block of ice. The ice block is placed in a 1L glass beaker filled with ice cold water. The thermocouple is connected to a PASCO interface and a "Temperature vs. Time" graph is displayed on the projected computer screen in the classroom. Heat is applied until the ice melts. Its liquid phase (water) is further heated to its boiling point, releasing water vapor.

On the plot, one can observe the frozen H2O ice temperature rise to 0C, then hold flat until all the ice is melted. This is due to the latent heat of fusion of H2O. With further heating, the temperature of the water rises to 100C. Then the temperature stays at 100C, because of the latent heat of vaporization for H2O.


!! This demo should be requested at least a day before it is needed. It takes time to prepare the ice block!!

Using liquid nitrogen and glass Dewar, ice can be cooled down to -30 deg. Celsius.

Typically takes about 25 minutes from start to finish.