Rhe (unit)
The rhe ( unit symbol : rhe ) was an internationally not accepted unit of measurement for fluidity proposed before 1969 :
history
The term Rhe is derived from ancient Greek ῥεῖν rhein , German 'flow' and was proposed as a unit of measurement for the flowability of a fluid. This flowability was measured using a viscometer as invented and used by Leo Ubbelohde .
The International System of Units (SI) was introduced in the Federal Republic of Germany in 1970, in Austria in 1973 and in Switzerland in 1978 . With that the unit of measure Rhe lost all meaning, just like Poise , Stokes or Reyn (used mainly in Anglophone countries); the Rhine has been largely replaced in textbooks and in professional practice by the SI unit “ Pascal second ”.
swell
- Unit of fluidity Rhe
- Peter Kurzweil: The Vieweg unit lexicon . Vieweg, Braunschweig / Wiesbaden 2000, ISBN 978-3528069872 .
- Günter Scholz, Klaus Vogelsang: Units, symbols, quantities . Fachbuchverlag 1991, ISBN 3-343-00500-2 , books.google.de: p. 315
literature
- Ludwig Schiller (ed.): Three classics of fluid mechanics : G. Hagen, Jean Louis Marie Poiseuille, Eduard Hagenbach-Bischoff. Academic Publishing Company, Leipzig 1933.