What exactly do you mean by "absolute pressure"?

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It is the pressure equal to the algebraic sum of atmospheric and gauge pressures

It is the atmospheric pressure at mean sea level.

It is the atmospheric pressure expressed in $kg / {cm}^{2}$

It is the pressure as seen on the gauge of a pressure measuring instrument.

answer is C.

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Detailed Solution

Positive gauge pressure is above atmospheric pressure, and negative gauge pressure, commonly known as vacuum pressure, is below atmospheric pressure.

Absolute pressure is the sum of gauge pressure and atmospheric pressure.

Hence, the correct option is C.

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