viscosity

noun
vis·​cos·​i·​ty | \ vi-ˈskä-sə-tē How to pronounce viscosity (audio) \
plural viscosities

Definition of viscosity

1 : the quality or state of being viscous : a sticky or glutinous consistency
2a technical : the property of resistance to flow in any material with fluid properties … water has a small but measurable viscosity, or "stickiness," which results from the weak mutual attraction of water molecules.— Hans Christian von Baeyer
b : the mathematical ratio of the tangential frictional force per unit area to the velocity gradient perpendicular to the direction of flow of a liquid

called also coefficient of viscosity

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Examples of viscosity in a Sentence

conducted an experiment to determine the viscosity of motor oil

Recent Examples on the Web

So a common way to look for a quark-gluon plasma is to look for evidence of flow without viscosity. Chris Lee, Ars Technica, "Quark-gluon plasma reveals viscosity-free properties," 19 Dec. 2018 That's key, because many industrial strategies for stabilizing foams rely on altering the viscosity; this shows those methods are ineffective. Jennifer Ouellette, Ars Technica, "Two new papers explore the complicated physics behind bubbles and foams," 19 June 2019 Dissipation results from a fluid’s viscosity, or internal friction. Quanta Magazine, "Famous Fluid Equations Are Incomplete," 21 July 2015 Scan the ingredient list: dry oils contains higher percentages of low-viscosity oils—such as grapeseed, argan and rosehip—which have a molecular structure that gives them a lightweight feel. Kari Molvar, Vogue, "Why Top Facialists Are Swapping Out Body Cream For “Dry Oil” in Summer," 3 July 2019 Oil: Crude oil, a liquid composed mainly of carbon and hydrogen, is often black, but exists in a variety of colors and viscosities depending on its chemical composition. Christina Nunez, National Geographic, "Fossil fuels, explained," 2 Apr. 2019 For non-Newtonian fluids like oobleck, however, the viscosity changes in response to a shearing force. Jennifer Ouellette, Ars Technica, "New electrolyte recipe keeps lithium-ion batteries from catching fire," 23 Aug. 2018 Because watercolors have such low viscosity, the dynamics are very different—and thus, the techniques artists employ are also different. Jennifer Ouellette, Ars Technica, "Study: modern masters like Jackson Pollock were “intuitive physicists”," 26 Dec. 2018 Fluids with no viscosity at all, like superfluids, have some really weird properties. Chris Lee, Ars Technica, "Quark-gluon plasma reveals viscosity-free properties," 19 Dec. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'viscosity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of viscosity

14th century, in the meaning defined at sense 1

History and Etymology for viscosity

Middle English viscosite, from Anglo-French viscosité, from Medieval Latin viscositat-, viscositas, from Late Latin viscosus viscous

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More Definitions for viscosity

viscosity

noun
vis·​cos·​i·​ty | \ vis-ˈkäs-ət-ē How to pronounce viscosity (audio) \
plural viscosities

Medical Definition of viscosity

1 : the quality of being viscous especially : the property of resistance to flow in a fluid or semifluid
2 : the ratio of the tangential frictional force per unit area to the velocity gradient perpendicular to the direction of flow of a liquid

called also coefficient of viscosity

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