What happens to length of the mercury column if a small amount of water vapor is in the vacuum part?

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Explanation:

Inches of mercury is ideal for vacuum lifting with vacuum cups, as the amount of vacuum required is rarely high. Typical vacuum handling utilizes anything between 15″Hg and 25″Hg. Therefore, “Hg is suitable as a measurement of system performance in this type of operation

The column of mercury employed in a mercury barometer, the height of which (inches of mercury) is used as a measure of atmospheric pressure.

At some point, all water vapour that is found in a vacuum system came from the atmosphere. Consider that air at 25° C and 50% relative humidity contains 12 torrs of water vapour. ... Additionally, any surface will adsorb a certain number of monolayers of water molecules.

Credits:

Vacuum Measurement: A Basic Guide - Fluid Power Journal

Sources of Water Vapor in Vacuum Systems | Normandale ...

electrical to thermal