4A30.20 - Balls and Rings

Balls and rings

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PIRA Classification: 4A30.20

Description: A brass sphere is slightly too large to fit through a brass ring. If the ring is heated with a burner, it will expand just enough to let the ball through. Also, the ball can be cooled with liquid nitrogen, allowing it to pass through the (room temperature) ring.

Special Instructions: Don't leave the heated ring around a ball.

Condition: Ok

Setup time: 2 minutes

Safety Issues: Don't burn yourself.