Physics
Scientific paper
May 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961natur.190..523b&link_type=abstract
Nature, Volume 190, Issue 4775, pp. 523 (1961).
Physics
Scientific paper
IN order to obtain a unit of pressure in terms of the height of a column in a liquid manometer, a unit which is also related decimally to absolute units of pressure, Dr. Florescu proposes to elevate the pressure due to a 0.75-mm. column of liquid of density 13.5951 gm./cm.3, g being 980.7455 cm./sec.2, to the status of a new unit, and call it the `vac'. But as Dr. Florescu admitted oPiginally, this pressure is effectively 103 dynes/cm.2, called internationally the millibar, and for the practical purposes of vacuum technology the pressure due to ¾ mm of a standard mercury column (density 13.5951 gm./cm.3, standard gravity 980.665 cm./sec.2) is one millibar (more closely it is 0.99992 mb.). Quite apart, therefore, from Dr. Volet's point, with which I entirely agree, I see no justification for introducing a new unit, the `vac', the definition of which involves a new, arbitrary reference gravity, when the scale it would provide would in vacuum practice be indistinguishable from a scale of millibars.
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