A U-tube manometer must be open at both ends in order to give an accurate reading.

Name: A U-tube manometer must be open at both ends in order to give an accurate reading.
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Question

Quizplus · Accepted Answer

A U-tube manometer must be open at both ends to allow atmospheric pressure to act on the fluid, ensuring an accurate reading. If either end of the manometer is closed, the pressure inside the tube will be different and will affect the accuracy of the reading.

A U-Tube Manometer Must Be Open at Both Ends in Order