Measurement and Mechanics (Classic Reprint) - Hardcover

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Excerpt from Measurement and Mechanics

Exp. 2. - Now gently warm the glass under the wax. After a short time the under layers of wax will melt and Spread. Tilt the glass and notice that the upper layers of wax flow over the lower layers. Hence, at higher temperature wax becomes a viscous fluid.

It will be found, however, that at intermediate temperatures the wax is neither a solid nor a viscous fluid. It will resemble the treacle in the fact that it is easy to make a dent in either, but the dent in the treacle will be rapidly filled up and disappear, whilst that in the wax will remain for a considerable time, and. It may be, permanently. At these intermediate temperatures wax can be moulded between the fingers.

Definition. The plastic state is a state intermediate between the viscous and the solid state. In this state little force is required to produce change of Shape, and such change when produced is to a large degree permanent.

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