Essential University Physics
Essential University Physics
4th Edition
ISBN: 9780134988559
Author: Wolfson, Richard
Publisher: Pearson Education,
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Chapter 16, Problem 1FTD

Does a thermometer measure its own temperature or the temperature of its surroundings? Explain.

Expert Solution & Answer
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To determine
Whether a thermometer measures its own temperature or temperature of the surroundings.

Answer to Problem 1FTD

A thermometer measures its own temperature rather than surrounding temperature.

Explanation of Solution

The principle of working of thermometer is actually based on the expansion of mercury in temperature. When mercury is allowed to heat it undergoes expansion. The mercury expands until it is in thermal equilibrium with heat of radiation which is in contact. The thermometer calibrated to measure that temperature.

If a thermometer is placed in sun radiation the mercury absorbs that radiation and expands until it is in thermal equilibrium. Therefore it shows a greater temperature than the air temperature. Therefore thermometer measures the temperature of the mercury rather than temperature of the surroundings.

Conclusion:

Thus, a thermometer measures its own temperature rather than surrounding temperature.

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Chapter 16 Solutions

Essential University Physics

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