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Ball and Ring H-a3b
The Ball will pass through the hole in the brass plate (termed the ring) when both are at room temperature. When the ball is heated with the torch it expands and will not pass through the ring. Fishbane Chapter:   21.4 HRW 9th:   18.06 Reese Chapter:   13.7 SJ 3rd Chapter:   16.3 PIRA DCS classification:   4A30.20

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University