Measurement of absolute pressure- Thermodynamics

Q.  Absolute pressure is measured as
- Published on 21 Aug 15

a. Gauge pressure – Atmospheric pressure
b. Gauge pressure + Atmospheric pressure
c. Gauge pressure / Atmospheric pressure
d. none of the above

ANSWER: Gauge pressure + Atmospheric pressure
 
Most pressure measuring instruments indicate pressure relative to the atmospheric pressure, Whereas the pressure of a system is its pressure above zero, or relative to a perfect vacuum. The pressure relative to the atmosphere is called as gauge pressure. The pressure relative to the perfect vacuum is called as absolute pressure.

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