Gauge Pressure and Absolute Pressure: Gauge Pressure: It is convenient to measure pressure in terms of taking atmospheric pressure as reference datum. Pressure measured above atmospheric pressure is known as gauge pressure. The atmospheric pressure on the scale is marked as zero. Absolute Pressure: Since, atmospheric pressure changes with atmospheric condition, a perfect vacuum is taken as an absolute standard of pressure. Pressure measured above perfect vacuum are called absolute pressure. The figure explains the concept of gauge and absolute pressure. Absolute pressure = atmospheric pressure + gauge pressure P abs = P atm + P gauge Fig. 1 Concept of gauge and absolute pressure Pascal's Law: It states that the intensity of pressure at any point in a liquid at rest is same in all direction. We consider a fluid...
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