It is a scientific tool used to demonstrate the principle of thermal expansion in metals.
Features
Function: At room temperature, the brass ball passes freely through the brass ring. When the ball is heated, it expands and can no longer pass through the ring. When the ball cools down, it contracts and can once again pass through the ring. Components: The apparatus typically consists of a brass ball and a brass ring, each mounted on an insulated handle to protect the user's hands from heat. Educational Use: It is a common demonstration tool in physics and chemistry classes to show how metal expands when heated and contracts when cooled. Availability: These devices are available from various scientific supply companies and educational retailers.