Gravesande Ball and Ring (0788) Specifications : Length of the bar 130 mm – Length of the chain 100 mm. Simple and effective piece of equipment for qualitative experiments. A concrete demonstration of the cubic thermal expansion of a solid. Ring and ball on chain with 2 wooden handles. The ball passes through the ring when cold but will not pass through after being heated. LAWS & PRINCIPLES INVESTIGATED : • Cubic thermal expansion of solids. Qty :