Define absolute pressure, atmospheric pressure.

Define absolute pressure, atmospheric pressure.
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Answer :

Absolute Pressure : Absolute pressure is defined as actual total pressure including atmospheric pressure acting on a surface 

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Unit of absolute pressure is pounds per square inch absolute and it is represented by psia. 

Atmospheric Pressure : Atmospheric Pressure or Barometric pressure is defined as the pressure exerted by the air surrounding to the earth. Unit of atmospheric pressure is Pounds per square inch.

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