Answer :

Final answer:

Deep vacuum is typically measured in microns which refers to micrometers or one millionth of a meter. They are used in vacuum applications to ensure minimal air or gases remain in the system.

Explanation:

A deep vacuum is typically measured in microns. The term micron refers to micrometers, or one millionth of a meter. In vacuum applications, it is used as a measure of vacuum pressure. A good quality vacuum requires microns measurement to ensure minimal air or other gases remain in the vacuum system. While psia and psig are measures of pressure, inches of Hg is a unit of pressure typically used in weather forecasting. Microns are the most fitting among these options, because of their capacity to measure very low pressures, as in deep vacuums.

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