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.
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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:
| Condition | Pressure Range |
|---|---|
| high vacuum | 10-3 to 10-6 torr |
| very high vacuum | 10-6 to 10-9 torr |
| ultrahigh vacuum | 10-9 torr and below |
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
