Imagine a fluid moving parallel to it on the horizontal plane. Units of SI: Coefficient of viscosity Nm-2s(or)Pa-s.(or) Poiseuill e Units of C.G.S: Coefficient of viscosity poise. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'viscosity.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. The property of a liquid by virtue of which an opposing force (internal friction) comes into play between different layers of a liquid, whenever there is a relative motion between these layers of the liquid is called viscosity. Viscosity: The property of a fluid which opposes the relative motion between the layers is called viscosity. John Timmer, Ars Technica, 21 July 2022 See More 2022 To help avoid this, Cuberg mixes in additional chemicals (one of them is an organic chemical called an ether) to lower the viscosity and improve the stability. Jordana Cepelewicz, Quanta Magazine, 16 Nov. Pete Robins, Field & Stream, Perhaps the oldest and most prominent of these equations, formulated by Leonhard Euler more than 250 years ago, describe the flow of an ideal, incompressible fluid: a fluid with no viscosity, or internal friction, that cannot be forced into a smaller volume. Allison Futterman, Discover Magazine, 4 July 2022 The secret sauce is an improved drag grease that exhibits a low viscosity at rest but becomes more viscous immediately after drag start up. 2022 The amount of silica determines the lava’s viscosity. Jennifer Ouellette, Ars Technica, 24 Nov. In liquids, viscosity is mainly caused by cohesive forces between molecules like hydrogen bonds, van der Waals forces, and dipole-dipole interactions. Katie Walsh, Los Angeles Times, 14 June 2023 As the bottle empties, the viscosity decreases because there is less and less ketchup to push. 2023 The character’s surfaces are constantly moving: faces of flame flicker and crackle with the grace of a watercolor painting bubbles float and churn and pop through the bodies of the watery folk, held together with a tenuous viscosity. 2023 Glucosamine helps in the formation and repair of cartilage, while chondroitin supports joint fluid viscosity, reducing joint strain and pain. ![]() Joanna Thompson, Scientific American, 22 Aug. Recent Examples on the Web Blood and saline solution have very different viscosities, meaning they are absorbed at different rates.
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