What is vacuum pressure is pressure measured in a space where pressure is below atmospheric pressure, indicating how much gas has been removed, essentially degree of emptiness. Atmospheric pressure at sea level is about 101.325 kilopascals or 760 torr or 14.7 psi, so vacuum pressure is any pressure below that, often expressed as negative gauge pressure or as absolute pressure. For example, perfect vacuum would be 0 pascals absolute pressure, while high vacuum might be 1e-6 torr. Vacuum pressure can be measured using gauges like Bourdon gauge for low vacuum, Pirani gauge for medium, ionization gauge for high vacuum. In vacuum cleaners, vacuum pressure or suction is measured in air watts or pascals, indicating lifting ability. In industrial systems, vacuum level determines process, low vacuum for packaging, medium for degassing, high for coating. The lower the absolute pressure, the higher the vacuum quality, meaning fewer molecules remain. Vacuum pressure is important because it affects boiling point, heat transfer, and contamination. So vacuum pressure is not negative pressure in absolute terms but pressure below ambient, quantifying how close to perfect vacuum a space is.
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