Quick Answer: The Ball and Ring Apparatus demonstrates the thermal expansion of solids with a metal ball and a matching metal ring. At room temperature the ball passes through the ring; once heated, it expands and no longer fits.
Last updated: October 2026
Key Features
Metal ball with a matching metal ring
Ball passes through the ring cold but not when heated
Ball contracts on cooling and passes through again
Manual heating and cooling demonstration
Technical Specifications
Specification
Value
Material
Laboratory-grade metal components
Application
Demonstration of thermal expansion of solids
Operation
Manual heating and cooling demonstration
Concepts covered
Heat, temperature, expansion, contraction, thermal expansion of metals
About This Product
Few demonstrations make expansion as obvious: the same ball that slipped through the ring sticks after heating, then drops through again once it cools. It introduces heat, temperature and the physical properties of metals in school and college physics.
Frequently Asked Questions
Why does the heated ball not pass through the ring?
Heating makes the metal ball expand, so it no longer passes through the ring. After cooling it contracts and passes through again.
