High Vacuum

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High Vacuum

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The condition in a gas-filled space at pressure less than 10-3 torr. </dd>
The term high vacuum has frequently been defined as a pressure less than some upper limit. High vacuum (and similar vacuum terms) should not be defined as a pressure but rather as the condition or state in a gas-filled space at pressures less than some upper limit or within specified limits. The following classification of degrees of high vacuum has been proposed:

<tbody> </tbody>
ConditionPressure Range
high vacuum10-3 to 10-6 torr
very high vacuum10-6 to 10-9 torr
ultrahigh vacuum10-9 torr and below

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References

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