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Revision as of 01:32, 12 March 2002 by 212.250.215.13 (talk)(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 100 Pa.s
- honey 10000 Pa.s
Contrary to many assertions, glass is an amorphous solid, not a liquid, and it does not flow. See the article on glass for more details on this.