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

Regelation in Ice Purpose: Substances that expand on freezing show a lower melting point under pressure. Regelation is the phenomenon of melting under pressure and freezing again when the pressure is reduced. This can be demonstrated by cutting through a block of ice with a wire loop that has a heavy mass hanging from it. Procedure: This demo must be requested well in advance, so that we can freeze a block of ice overnight. Cut the top off of a 12 oz (or longer) soda can. Fill with distilled water and place in staff lunch room freezer overnight. Slow cooling just below water's freezing point makes clearer ice. Just before showing demo, remove ice block, place piano wire over it hanging heavy weights on the ends. This can be done many different ways, with or without pulleys. An example of regelation includes the flow of glaciers.