Looking for a simple tool to demonstrate the concept of thermal expansion and contraction? Our Physics Thermal Expansion Experiment Tool is the unmissable choice! This tool includes a metal ball that can pass through a ring at room temperature, but when heated, it no longer fits through the ring. Features -Color:As Shown -Material:Plastic, stainless steel -Size:27.00X3.80X2.50cm/10.61X1.49X0.98in - Our physics experiment tool is ideal for teaching thermal expansion and contraction experiments. - The metal ball can pass through the ring at room temperature, but cannot pass through after being heated. - The metal ball is a simple aid for demonstrating thermal expansion and contraction, making it easy to understand. - Thephysics demonstration experiment tool is easy to use, requiring no special skills. - The physics experiment material is strong and long-lasting, ensuring reliable performance. Package list: 1 x set of Teaching Aid