Linear Expansion Apparatus

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$31.95 $24.95
(1 review)
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Economically and accurately demonstrates the coefficient of thermal expansion of different metals with an easy to read scale. This apparatus contains 3 removable rods (aluminum, brass & steel), each measuring 7.25" / 18.4cm in length. When heated by a candle (votives recommended, not included), the metals will expand at different rates as demonstrated by the pointers to which they are attached. The rods can be removed and re-positioned on different pointers. This apparatus is easy to adjust and quick to zero. Includes heat plate and candle holder / wax trough.

Instructions included.

Dimensions (lxwxh): 9.25" x 3.25" x 11" / 23.5cm x 8.25cm x 28cm
Weight: 2 lbs.


  • 4
    Great Demo!

    Posted by Mark Stephens on Feb 26th 2015

    I've been around awhile, and this is the only demo I've found (at a reasonable price) that shows differential thermal expansion of several materials. The zeroing mechanism is quick and simple, and the pointers are easy to see. Tip: Instead of using votive candles for heat, I mounted an aluminum heat shield under the rods, and use a heat gun to get them hot. They don't expand much, but it gets the point across nicely. Good job!