Units of Pressure in Vacuum Work

Details Units of Pressure in Vacuum Work Units of Pressure in Vacuum Work

Mar 1913

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1913natur..91r..59s&link_type=abstract

Nature, Volume 91, Issue 2264, pp. 59 (1913).

Physics

Scientific paper

SURELY physicists do, or should, for convenience, always express wave-lengths in microns (µ) and molecular distances in millimicrons (µµ). Why not follow the same practice in dealing with vacua? The millimetre is a convenient unit down to, say, 0.1 mm., but 1/1000 mm. and 1/10,000 mm. have frequently to be expressed. It is simpler to write and comprehend these in the form 1 µ or 0.1 µ. Again, in the pamphlet sent out by Dr. Gaede to describe his very successful pumps, we see unwieldy decimal expressions used. For instance, it is stated that it is possible to obtain a pressure of 0.000002 mm. of mercury after four minutes of pumping. Why not write this 2µµ of mercury?

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