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A device with one side open to the air, used to measure gauge pressure, is a:

AManometer
BMagnetometer
CMicrometer
DMilliampere
Answer & Solution
Correct answer: A. Manometer
1. A fluid column shows the difference. 2. One limb feels the atmosphere. 3. That device is a manometer. _Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._
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