The glass tube of thermometer is filled with _____.

Alcohol

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Mercury

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Water

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None of the above

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Solution

The correct option is A Mercury
The glass tube of thermometer is filled with mercury. It is a reflective liquid. It is bright and opaque, so it’s easy to see movement of mercury inside the capillary tube and to read accurately. Mercury does not even wet the glass. So, if temperature is falling then you do not get inaccurate readings. It is also good conductor of heat. So, it responds quickly to change in temperature.

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