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
Guthrie and Wakerling, Vacuum Equipment and Techniques (McGraw-Hill, 1948).
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WORRELL, F. Units in Vacuum Measurements. Nature 199, 476–477 (1963). https://doi.org/10.1038/199476a0
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DOI: https://doi.org/10.1038/199476a0
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