The unit of absolute viscosity in the British gravitational system of units, 1 pound-force second per square inch, approximately 6.89476 × 106 centipoise.
It is named for Sir Osborne Reynolds (1842–1912). Together with the centipoise, it was one of two viscosity units endorsed at the 1957 London Conference on Lubrication and Wear.
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Last revised: 11 February 2001.