USCG Exam PracticeThermodynamics and heat exchangers
What is the relationship between gauge pressure and absolute pressure?
- A. Absolute pressure equals gauge pressure minus atmospheric pressure.
- B. Gauge pressure equals absolute pressure plus atmospheric pressure.
- ✓ Absolute pressure equals gauge pressure plus atmospheric pressure.Correct
- D. Absolute pressure and gauge pressure are equal at sea level.
Why C is correct
DOE-HDBK-1012 §1-1 defines absolute pressure as gauge pressure plus atmospheric pressure. A perfect vacuum is zero absolute pressure, confirming that atmospheric pressure must be added to gauge reading to obtain absolute.
Cited:DOE-HDBK-1012 §1-1