Adrienne Bernhard, Popular Mechanics, 20 Mar. The Physics Arxiv Blog, Discover Magazine, 19 July 2021 In his 1687 work Principia, Sir Isaac Newton laid down the foundations of fluid viscosity, which led to the development of oil lubrication. John Timmer, Ars Technica, 21 July 2022 Roman and colleagues says that the viscosity of magma can change over time. 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. Katie Walsh, Los Angeles Times, 14 June 2023 As the bottle empties, the viscosity decreases because there is less and less ketchup to push. Recent Examples on the Web 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.
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