Ball and Ring

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Ball and Ring

2 rods one with a ring on the end and another with a ball both made of steel.

PIRA: 4A30.21

Most solids, like gases, expand when heated and contract when cooled. To demonstrate this, a metal ball, specially constructed so that it is just a little too small to fit through a similar metal loop, is cooled in liquid nitrogen and/or the hoop is heated on a propane stove. The ball will then easily fit through the loop, with lots of room to spare.