say something about absolute pressure
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it is zero referenced against a perfect vaccum
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Definition: The absolute pressure, or total pressure, is measured relative to absolute zero on the pressure scale which is a perfect vacuum and is the sum of gauge pressure and atmospheric pressure. It is the same as the thermodynamic pressure. Absolute pressure accounts for the atmospheric pressure, which in effect adds to the pressure in any fluid which is not enclosed in a rigid container ie., the fluid is open to the atmosphere.
P = P_o + P_g
where P_o and P_g are respectively atmospheric pressure and the gauge pressure Absolute pressure can be never negative.
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