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The measure of resistance to flow of a fluid against an established standard. See SUS and SSU.

Viscosity is the characteristic property of liquid, viscosity describes the flow of a liquid. 1) Viscosity is defined as the resistance in the flow of a liquid Or
2) Internal friction present between two layers of a liquid which resists the flow of liquid is commonly known as Viscosity.
? A liquid with high viscosity is thick and flows slowly.
? A liquid with low viscosity is thin and flows quickly.
? Different liquids have different viscosities.