Vacuum

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Vacuum

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1. A given space filled with gas at pressures below atmospheric pressure. Various approximate ranges are:
low vacuum, torr 760 to 25;
medium vacuum, torr 25 to 10^-3;
high vacuum, torr 10^-3 to 10^-6;
very high vacuum, torr 10^-6 to 10^-9;
ultrahigh vacuum, torr 10^-9 and below. </dd>
2. In reference to satellite orbital parameters, without consideration of the perturbing effects of an atmosphere, as in vacuum perigee, vacuum apogee. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use