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Question

The fluid used in aneroid barometer is

A
water
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B
mercury
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C
air
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D
alcohol
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Solution

The correct option is C air
An aneriod barometer is made up of a vacuum chamber covered by a thin elastic disk. High atmospheric pressure pushes against the disk and causes it to bulge inward, while low pressure does not push as hard, allowing the disk to bulge outward.

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