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A positive pressure less than atmospheric pressure is

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A positive pressure less than atmospheric pressure is

(a) Absolute pressure

(b) Gauge pressure

(c) Static pressure

(d) Vacuum

The question was asked at a job interview.

My enquiry is from Pressure and Hydrostatic Head-II in chapter Introductory Concepts of Chemical Process Calculation

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Correct choice is (d) Vacuum

To explain I would say: A positive pressure less than atmospheric pressure is vacuum.

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