- the property of a fluid that resists the force tending to cause the fluid to flow.
- the measure of the extent to which a fluid possesses this property.
Origin of viscosity
OTHER WORDS FROM viscosityhy·per·vis·cos·i·ty, noun
Words nearby viscosity
How to use viscosity in a sentence
That viscosity limit depends on the Planck constant, a number at the heart of quantum mechanics, the math that governs physics on very small scales.Fundamental constants place a new speed limit on sound|Emily Conover|October 9, 2020|Science News
For half a century it’s been known that vortex helicity is conserved in an ideal fluid — basically, a fluid that has no viscosity, meaning it offers no resistance to an object pushing through it.
He showed that the knots, links and writhing — ignoring the twisting — don’t lose their combined helicity to viscosity.
The lab has also developed various mixtures of magnetic particles and fluids that have “odd viscosity” — a sort of frictionless viscosity that enables waves to travel across the surface of the mixture without losing any energy.
That means its viscosity — how thick it is — changes when force is applied to it.
The oil pressure will vary according to weather conditions and viscosity of oil used.Aviation Engines|Victor Wilfred Pag
By the old gravity systems, the flow of oil depended largely upon its viscosity, or thickness.The Gasoline Motor|Harold Whiting Slauson
A viscous precipitate forms which frequently loses its viscosity when heat is applied.The Elements of Bacteriological Technique|John William Henry Eyre
The effect on gelation is also illustrated by the change of viscosity of the sol with time.Animal Proteins|Hugh Garner Bennett
Both the suddenness of their formation and the slowness with which they widen are demonstrative of the non-viscosity of the ice.Hours of Exercise in the Alps|John Tyndall
British Dictionary definitions for viscosity
- the extent to which a fluid resists a tendency to flow
- Also called: absolute viscosity a measure of this resistance, equal to the tangential stress on a liquid undergoing streamline flow divided by its velocity gradient. It is measured in newton seconds per metre squaredSymbol: η See also kinematic viscosity, specific viscosity