Discussion
Statement I: An absolute pressure sensor reads atmospheric pressure when open to the air.
Statement II: It references a sealed evacuated cavity rather than the surrounding atmosphere.
In the light of the above statements, choose the correct answer.
Answer: A
Both are true and the second is the reason. A gauge sensor referenced to ambient reads close to zero in the same situation, which is why the type has to be known before a reading is interpreted. The data plate settles it.
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