The Ball & Ring Gravesande's - Chain Typeis a classic physics demonstration tool designed to show the expansion and contraction of metals with heat. At room temperature, the brass ball easily passes through the metal ring. Once the ball is heated, it expands and can no longer pass through the ring, visually demonstrating the principle of thermal expansion.
This apparatus includes a brass ball and ring, both mounted on sturdy steel rods with wooden handles for safe handling. It’s an engaging way to introduce material behaviour, molecular motion, and temperature effects.
Educational Benefits:
Demonstrates thermal expansion of solids
Supports conceptual understanding of temperature and volume
Encourages predictive thinking and observation
Aids discussion on atomic structure and kinetic theory
Classroom Ideas:
Compare cooled vs heated metal behaviour
Use in group demonstration to introduce heat expansion
Explore real-world implications (e.g. railway tracks, bridges)
Specifications:
Includes: Brass ball and ring on 2 separate handles 
Mounting: Steel rods with wooden handles
Features: Chain connection for ease of use
Use: Thermal expansion demonstration
Units: Each