Space Equivalent

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Space Equivalent

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A condition within the earth's atmosphere that is virtually identical, in terms of a particular function, with a condition in outer space. </dd>
For example, at 50,000 feet, the drop in air pressure and the scarcity of oxygen creates a condition, so far as respiration is concerned, that is equivalent to a condition in outer space where no appreciable oxygen is present; thus, a physiological space equivalent is present in the atmosphere. </dd>

References

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