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Q.

Which among the following is used in the aneroid barometer?


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a

Water

b

Mercury

c

Air

d

alcohol 

answer is C.

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Detailed Solution

Air is used in the aneroid barometer.
The instrument used to measure air pressure is the aneroid barometer. An aneroid barometer does not use any liquid to measure; instead, it uses air as an appliance to measure atmospheric pressure. It is made up of an empty chamber covered by a thin elastic disk. High atmospheric pressure is pushed against the disk, and a bulge inward is caused, while low pressure does not push as tough, allowing the disk to bulge outward.
 
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