Viscosity vs. Density - What's the difference? | Ask ...
Viscosity vs. Density. Published: 21 Sep, 2021. Viscosity noun (uncountable) The state of being viscous. Density noun (physics) A measure of the mass of matter contained by a unit volume. Viscosity noun. A quantity expressing the magnitude of internal friction in a fluid, as measured by the force per unit area resisting uniform flow.