For Vacuum we have terms and definitions in 5 topics. The topics are Automotive, Car Engine, Food Preservation, Natural Gas and Physical Geography.

Vacuum (Automotive)

A pressure lower than atmospheric, in an enclosed area.

Vacuum (Car Engine)

Refers to a volume of space that has little or no pressure due to the absence of air or any other gasses; there are differing degrees of vacuum, which is why Empire Magnetics offers three different grades of vacuum rated motors and related products.

Vacuum (Food Preservation)

The state of negative pressure. Reflects how
thoroughly air is removed from within a jar of processed
food--the higher the vacuum, the less air left in the jar.

Vacuum (Natural Gas)

A pressure less than atmospheric pressure, measured either from the base of zero pressure or from the base of atmospheric pressure.

Vacuum (Physical Geography)

(1) Space devoid of atoms or molecules.
(2) Emptying of air.

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