Discussion
A pressure is quoted as 2 bar gauge. What is it in absolute terms, taking atmospheric pressure as 1 bar?
Answer: A
Correct answer: 3 bar
Gauge pressure is measured from atmospheric, so \[ P_{abs} = P_{gauge} + P_{atm} = 2 + 1 = 3\ \mathrm{bar}. \] A gauge reading zero means the vessel is at atmospheric pressure, not at vacuum, and a negative gauge reading is a partial vacuum. The distinction is worth care because a plant gauge and a thermodynamic calculation use different zeros.
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