rhen.
/riː/, U.S. /ri/ Physics.
A unit of dynamic fluidity in the cgs system, defined variously as the reciprocal of the poise or the centipoise. Also: a unit of kinematic fluidity in the cgs system, defined as the reciprocal of the centistokes (rare).
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poise1913
centipoise1916
rhe1924
stokes1931
centistokes1933
1924 Science 26 Dec. 596/2 Absolute unit of fluidity. Eugene C. Bingham. The term reciprocal poise is not a satisfactory term for the absolute unit of fluidity. The term rhe is suggested.
1925 E. C. Bingham in Industr. & Engin. Chem. 17 47/2 The absolute unit of fluidity has no name, and since fluidities are additive rather than viscosities, the awkward term ‘reciprocal poises’ is coming into use. The author suggests the term ‘rhe’ from the Greek rheo; (flow) to be pronounced ree.
1933 Physics 4 207/2 All the alcohols have a positive association as expected, and it is appreciably higher at a fluidity of 10 rhes than at 50 rhes.
1974 McGraw–Hill Dict. Sci. & Techn. Terms 1261/1 Rhe... 2. A unit of kinematic fluidity, equal to the kinematic fluidity of a fluid whose kinematic viscosity is 1 centistoke [sic].
2007 G. E. P. Box & N. R. Draper Response Surfaces, Mixtures & Ridge Anal. (ed. 2) xi. 381 Fluidity (rhes).
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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