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Revision as of 23:11, 23 May 2003 by 142.103.168.38 (talk) (reverted to edit by Tobias Hoevekamp)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)Viscosity is a property of fluids describing its internal resitance to flow and may be thought of as fluid friction. If the viscosity of a fluid is constant (neglecting temperature and pressure effects) it is said to be a 'newtonian' fluid. Non-newtonian fluids exhibit a variation of viscosity depending on gradients within the flow field, the history that a fluid 'particle' experiences on its flow path, etc. If the viscosity of a fluid solely depends on the gradients within the flow field it is called generalized newtonian or purely newtonian. Rheology is the field of science that deals with viscosity.
Some viscosities of (newtonian) fluids are listed below (more to follow):
air 0.00001 Pa.s
water 0.001 Pa.s
oil xxx Pa.s
glass xxx Pa.s (even glass is a fluid though it is perceived as a solid. Due to its very high viscosity, glass flows very very slowly.)