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Ring and Ball Apparatus

Ring and Ball Apparatus

Product Code : SCL-OS-12243

Quick Answer: The Ring and Ball Apparatus is a brass ball, 25mm in diameter, and a brass ring matched so that the cold ball just passes through. Both have heat-resistant insulated grips for demonstrating the thermal expansion of metals.

Last updated: October 2026

Key Features

  • Brass ball, 25mm diameter
  • Brass ring with matched clearance: the cold ball passes through
  • Heat-resistant insulated grips on both handles

Technical Specifications

SpecificationValue
MaterialBrass (ball and ring)
Ball diameter25mm
RingMatched clearance; ball passes when cold
HandlesHeat-resistant, insulated grips

About This Product

When cold, the ball slips through the ring; once the ball is heated it expands and no longer passes until it cools again. This quick test shows the thermal expansion of metallic solids. Schools, colleges and institutes in France, Malaysia, Uruguay, Qatar and Liberia can order the Ring and Ball Apparatus from Educational Instrument.

Frequently Asked Questions

How does the Ring and Ball Apparatus show expansion?

The 25mm brass ball passes through the matched ring when cold. Once heated, it expands and no longer fits until it cools.

Related: Optical Sectional.

For a quotation on the Ring and Ball Apparatus, contact Educational Instrument.

   
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