Miscellaneous
Ball and Ring
When the Ball and Ring are at room temperature, the ball easily fits through the ring. Heat the ball in a Bunsen burner flame and it expands and no longer fits through the ring.
When the Ball and Ring are at room temperature, the ball easily fits through the ring. Heat the ball in a Bunsen burner flame and it expands and no longer fits through the ring. If the ring is also heated, the ball will fit through it once again.
https://www.pasco.com/products/lab-apparatus/thermodynamics/heaters/se-7597#specs-panel