Letter | Published:

Units in Vacuum Measurements

Naturevolume 199pages476477 (1963) | Download Citation

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Abstract

ALONG with the growing unification of the various branches of physics there has been a trend toward unifying our systems of units. Originally the various branches developed systems of units peculiar to each; but as the branches have overlapped and merged some special units have been discarded in favour of those related in a simple way to the units selected as fundamental. The joule, for example, is beginning to replace the calorie as a heat unit, and meteorologists are changing from the inch of mercury to the bar for barometric pressures.

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References

  1. 1

    Guthrie and Wakerling, Vacuum Equipment and Techniques (McGraw-Hill, 1948).

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Affiliations

  1. Lincoln Laboratory (Operated with support from the U.S. Advanced Research Projects Agency), Massachusetts Institute of Technology

    • FRANCIS T. WORRELL

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https://doi.org/10.1038/199476a0

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