viscosity
n. C / Un. how thick or sticky a liquid is. It describes how easily a liquid flows, like how honey is thicker than water.
n. the measure of a fluid's resistance to flow or gradual deformation by shear stress or tensile stress. In common terms, it corresponds to the informal concept of thickness.
Honey has a much higher viscosity than water.
Engineers must choose a motor oil with the correct viscosity to ensure the engine parts remain lubricated in cold weather.
The experiment demonstrated that as the temperature of the polymer solution increases, its viscosity decreases, allowing it to pass through the narrow glass tubing with significantly less resistance.
From Middle French viscosité, from Old French viscosité, from Medieval Latin viscositas; analysable as viscous + -ity.
Uncountable when referring to the general property; countable when referring to specific measurements or types of fluids.