Name: Smashing a Racquetball Category: Thermodynamics Subcategory: Thermal Properties Classes:

Comments: Place a racquet ball in the liquid nitrogen for several minutes. Remove the ball with tongs and either throw against the floor or smash with hammer. Hazards: Warn students about the temperature of the pieces. Also warn if you are going to break it on the wall. Frozen pieces could hit the students in the face. I stronly suggest either breaking the ball on the floor or hitting it with a mallet on the lecture table.

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