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Home Products MechanicsBar and Gauge

Bar and Gauge

Model: P86Category: Mechanics

Bar and Gauge

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Product Overview

This apparatus is used for illustrating expansion by heating and contraction by cooling.
It consists of a mild steel bar 110 × 10 mm (length), mounted on a rod with a wooden handle, overall length approx. 280 mm; with a cast metal gauge.
The gauge has a cut-out that allows for a sliding fit over the ends of the bar, at room temperature.
Also, the gauge has a hole (10 mm bore) in one arm that allows the bar to pass endways, only when cold.
However, when the metal bar is heated, it does not fit into the gauge. When allowed to cool, the bar will fit into the gauge again.
Thus, heating the metal bar and then comparing it to the gauge provides an excellent visual demonstration of thermal expansion.

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