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4A30.30 - Forces Produced by Thermal Contraction

Demonstrates the forces produced by thermal contraction. Overview: Use a blast shield to prevent broken rod pieces from flying into audience. Instructions: A cast iron pin is inserted in the hole at the end of the center bar and the center bar is then heated by putting it on a ring stand over a fan shaped burner. After the bar is very hot, tighten the screw down against the frame, thus taking up the slack produced by the expansion. Now leave the bar to cool, or cool it with some water, and the pin will break with a snap.