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	Ring & Ball Apparatus Code: PS1011 Price: $8.99 Quantity in Basket: none
For demonstrating the expansion or contraction of metals. Consists of two brass rods with insulated handles. One of the rods has a ring and the other one has a ball of approximate diameter 25mm, attached at the end. The brass ball passes through the ring when both are at room temperature, but when the ball is heated it expands and can not pass through the ring.
	Compound Metal Bar Code: PS1001 Price: $4.95 Quantity in Basket: none
To demonstrate unequal expansion in different metals on heating. Highlights the role of temperature and materials in practical applications such as in thermostats. Due to differences in the co-efficients of linear expansion of both metals, the laminated strip bends dramatically on heating. Consists of a laminated strip of two different metals fitted in a wooden handle. The strip is about (l x w), 150 x 12mm.