Abstract
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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SHAW, P. Units of Pressure in Vacuum Work. Nature 91, 59 (1913). https://doi.org/10.1038/091059c0
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DOI: https://doi.org/10.1038/091059c0
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