Ball and Ring - SE-7597



Demonstrate Thermal Expansion

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.

Challenge your students' assumptions! If only the ring is heated, will the diameter of the hole increase or decrease as the metal expands?


  • 23 cm
Ball Diameter
  • ~ 2.36 cm at room temperature
Ring Inner Diameter
  • ~2.39 cm at room temperature