Physics Demo Manual

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.

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  - Boiling by Cooling Purpose: To show that water will boil at a temperature below 100C if the pressure above the liquid is reduced below atmosphere. Procedure:   DEMO VIDEO DOWNLOAD   Bring the water in the flask to a boil, remove from heat and seal with the stopper. Let the water cool for a few seconds to make a good seal and then invert the flask as shown in the second image below. At this point, all of the air in the flask should have been replaced with water vapor from the boiling water. Placing some ice in the concave bottom of the flask causes the water vapor to condense leaving a vacuum in the flask. Once the pressure has been reduced enough, the water will begin to boil.