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Instrumentation Reference Book, 4th Edition by Walt Boyes

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21.3. Measurement Techniques: Direct Effects

Instruments for measuring temperature described in this section are classified according to the nature of the change in the measurement probe produced by the change of temperature. They have been divided into four classes: liquid expansion, gas expansion, change of state, and solid expansion.

21.3.1. Liquid-in-Glass Thermometers

The glass thermometer must be the most familiar of all thermometers. Apart from its industrial and laboratory use, it finds application in both domestic and medical fields.

21.3.1.1. Mercury-Filled Glass Thermometer

The coefficient of cubical expansion of mercury is about eight times greater than that of glass. If, therefore, a glass container holding mercury is heated, the mercury ...

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