\re-▐ä-lә-jē\ n [ISV] (1929) Viscosity refer to how thick a liquid is or how easily it flows. A viscometer measures the resistance to flow of a rotating probe in a liquid in its of dyne.cm/s2 (Gooch JW (1997) Analysis and deformulation of polymeric materials. Plenum Press, New York). Viscosity is the study of deformation and flow of matter. Rheology, derived from the Greek rheos meaning “something flowing,” was proposed by Bingham in 1929 for the rapidly growing science of flow and deformation properties of materials, including liquids, solids, and even powders, in terms of stress, strain rates, and time. The following plot demonstrates the behavior of pure liquids (usually Newtonian), dispersions (pseudoplastic and dilatant). (ASTM, D5165-93 (2004) West Conshohoken, Pennsylvania; Goodwin JW, Goodwin J, Hughes RW (2000) Rheology for chemists. Royal Society of Chemistry; Munson BR, Young DF, Okiishi TH (2005) Fundamentals of fluid mechanics. Wiley, New York). See Dilatancy, Nonnewtonian...
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Gooch, J.W. (2011). Rheology. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_10025
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