Question

What is what is relation between atmospheric pressure absolute pressure and gauge pressure?

Answer 1

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Absolute pressure is zero-referenced against a perfect vacuum, so it is equal to gauge pressure plus atmospheric pressure. Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure.

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Answer 2

Answer:

Absolute pressure :

Absolute pressure is a pressure that is relative to the zero pressure in the empty, air-free space of the universe. This reference pressure is the ideal or absolute vacuum. It is denoted with the subscript “abs”: Pabs.

Gauge pressure :

The gauge pressure is defined as the difference between an absolute pressure (Pabs) and the prevailing atmospheric pressure (Pamb). It is denoted with the subscript “e”: Pe and is calculated as follows: Pe = Pabs – Pamb.

Explanation: