Vacuum

For other uses, see vacuum cleaner and Vacuum (musical group).

Perfect vacuum

A perfect vacuum is an ideal state that cannot practically be obtained in a labroratory, nor even in outer space, where there are a few hydrogen atoms per cubic centimeter at 10−14 pascal or 10−16 torr.

Related Topics:
Pascal - Torr

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In modern day usage vacuum is considered to exist in an enclosed space or chamber, when the pressure of gaseous environment is lower than atmospheric pressure (760 Torr or 101 kPa), or has been reduced as much as necessary to prevent the influence of some gas on a process being carried out in that space.

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