Quick Answer: The Ball and Ring apparatus, Brass is a thermal expansion demonstration made of a brass ball and a brass ring, each on its own insulated handle. At room conditions the ball is made to just fit through the ring.
Last updated: October 2026
Key Features
Brass ball and brass ring
Each part on an independent insulated handle
Ball and ring made as a close fit at standard temperature
Technical Specifications
Specification
Value
Material
Brass
Configuration
Ball and ring on independent insulated handles
Fit
Close fit at standard temperature and pressure
HS code
9023.00
About This Product
Heating the ball in a flame makes it expand so it no longer passes through the cold ring, and it drops through again once it cools or the ring is heated too. The simple test shows that solids expand when heated and contract when cooled. Schools, colleges and institutes in Guinea, Bahrain, Maldives, Liberia, Timor-Leste and Central African Republic can order the Ball and Ring apparatus, Brass from Educational Instrument.
Frequently Asked Questions
What does the Ball and Ring apparatus, Brass demonstrate?
It shows thermal expansion of a solid: the heated brass ball will not pass through the ring until it cools.
