Vacuum

Vacuum is defined as air pressure below atmospheric pressure

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Vacuum in torr, mm Mercury and psi

The vacuum level is the difference in pressure between the atmospheric pressure and the pressure in the evacuated system:

0% vacuum = 760 torr = 14.7 psia = 29.92 inc mercury abs = 101.4 kPa abs
50% vacuum = 380 torr = 7.3 psia = 15 inc mercury abs = 50.8 kPa abs
99.9% vacuum = 1 torr = 0.01934 psia = 0.03937 inc mercury abs = 1.3 kPa abs

For perfect vacuum (100%) - the pressure is 0 torr, 0 psia or 0 Pa abs.

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Related Topics

Gas and Compressed Air Gas properties, capacities of pipelines, sizing of relief valves - air, LNG, LPG and more

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