The absolute pressure is equal to:

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SSC JE Mechanical 4 Dec 2023 Official Paper - II
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  1. gauge pressure - atmospheric pressure
  2. gauge pressure + atmospheric pressure
  3. vacuum pressure + gauge pressure
  4. gauge pressure + atmospheric pressure + vacuum pressure

Answer (Detailed Solution Below)

Option 2 : gauge pressure + atmospheric pressure
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Detailed Solution

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Explanation:

The pressure in a fluid is measured in two different systems.

  1. In the first system, it is measured above the absolute zero or zero vacuum which is termed Absolute pressure.
  2. In the second system, Pressure is measured above the atmospheric pressure, it is known as Gauge Pressure.
    • ​​Gauge Pressure is measured after taking atmospheric pressure as a datum,
    • Thus it can be concluded that on the pressure scale atmospheric pressure is marked as zero.

 

Absolute Pressure = Atmospheric pressure + Gauge Pressure

∴ Gauge Pressure = Absolute Pressure – Atmospheric pressure 

Pgauge = Pabs - Patm 

∴ Vacuum pressure = Atmospheric pressure – Absolute pressure

Pvacuum = Patm - Pabs

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