Discussion
Which of the following is not a pressure measuring device?
Answer: A
The device that does not measure pressure is the Rotameter.
A rotameter is a variable-area flow meter: a float rises in a tapered vertical tube until the flow balances its weight, and its height shows the flow rate.
A piezometer measures gauge pressure by the height of liquid in a vertical tube, a manometer measures pressure with a column of liquid, and a differential manometer measures the difference of pressure between two points.
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