What pressure measurement is any pressure below atmospheric pressure?
A) Vapor pressure
B) Gauge pressure (psig)
C) Absolute pressure (psia)
D) Vacuum pressure (psiv)
Answer: D
Explanation: A) Incorrect. Vapor pressure is a measure of a substance's volatility and its tendency to form a vapor.
B) Incorrect. Gauge pressure (psig) is measured with respect to the Earth's surface at sea level.
C) Incorrect. Absolute pressure (psia) is pressure plus atmospheric pressure.
D) Correct. Vacuum pressure (psiv) is any pressure below atmospheric pressure.
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