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Is it true that the shining thread in the thermometer is the column of Mercury?

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True

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answer is A.

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Detailed Solution

The above statement is True.
A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end, which contains a small shining thread of Mercury. Mercury expands if the temperature increases; if the temperature decreases, the mercury contacts inside the glass tube.
The bulb in the glass expands very slightly at first, thus dropping the level of the Mercury, and then the Mercury warms and expands. This occurrence is taken into account in the calibration of the thermometer, and the temperature shown will be correct when both the glass and the Mercury are at the same temperature.

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Is it true that the shining thread in the thermometer is the column of Mercury?