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Which of equation represents the correct relation between absolute pressure Pabs, atmospheric pressure Patm, the gauge pressure Pg, vacuum pressure Pvac?

Which of equation represents the correct relation between absolute pressure Pabs, atmospheric pressure Patm, the gauge pressure Pg, vacuum pressure Pvac? Correct Answer P<sub>abs</sub> = P<sub>atm</sub> + P<sub>g</sub>

Concept:

Gauge pressure:

Gauge pressure is the pressure relative to atmospheric pressure. Most of the pressure measuring devices are calibrated to read gauge pressure.

  • Gauge pressure is positive for pressures above atmospheric pressure.
  • Gauge pressure is negative for pressures below atmospheric pressure.
  • Gauge pressure is zero at atmospheric pressure.

Atmospheric pressure:

Atmospheric pressure or barometric pressure is the pressure within the atmosphere of Earth. Atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.

Patm = 1.013 bar.

Absolute pressure:

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

Pabs = Pgauge + Patm .

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