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The digital vacuum gauge measures a vacuum in which units?

A. Inches of water column (IWC)
B. Microns
C. Psig
D. Psia

Answer :

Final answer:

Digital vacuum gauges measure vacuum pressure using units such as microns and inches of water column. The most commonly used unit for vacuum measurement is microns. Psig and Psia are not typically used for vacuum measurements.


Explanation:

Understanding Vacuum Gauges

A digital vacuum gauge is used to measure vacuum pressure, which can be represented in various units. Among the options provided, the appropriate units for measuring a vacuum include:

  • Inches of Water Column (IWC): This unit is commonly used for low pressure applications. It refers to how high a column of water would rise due to the pressure exerted by the vacuum.
  • Microns: Specifically, microns of mercury (or "torr") is often employed in high-vacuum situations. 1 micron corresponds to 1/1000 of a millimeter of mercury.

The other options, Psig (pounds per square inch gauge) and Psia (pounds per square inch absolute), are typically used for pressure measurements rather than vacuum measurements. Therefore, when measuring vacuum levels, both microns and inches of water column are relevant units, but the most common unit is often microns.


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