A given space filled with gas at pressures below atmospheric pressure.

Various approximate ranges are:
low vacuum, 101325 to 3000 Pa
medium vacuum, 3000 to 0. 133 Pa
high vacuum, 0.133 to 1.333x10-4 Pa
very high vacuum, 1.333x10-4 to 1.333224x10-7 Pa
ultrahigh vacuum, 1.333224x10-7 Pa and below

Heat Transfer
In a vacuum heat transfer is by radiation only.

See also: Absolute Vacuum, Partial Vacuum, Pressure, Ultimate Vacuum, Vacuum Pump.

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Subjects: Physics