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Question

An application of the Zeroth Law of Thermodynamics is

A
thermometer
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B
barometer
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C
manometer
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D
none of the above
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Solution

The correct option is A thermometer
Answer: A
The zeroth law justifies the use of suitable thermodynamic systems as thermometers to provide such a labeling, which yield any number of possible emprical temperature scales, and justifies the use of second law of thermodynamics to provide an absolute, or thermodynamic temperature scale. Such temperature scales bring additional continuity and ordering (i.e., "hot" and "cold") properties to the concept of temperature.

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