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Viscosity is a measure of the resistance of a fluid which is being deformed by either shear or tensile strength. In everyday terms (and for fluids only), viscosity is "thickness" or "internal friction".
the oppostion that a fluid ( liquid/gas ) offers to any object passing through it is called 'viscosity' of that fluid.
for example: honey is a thick fluid and doesn't allow any small object to pass through it easily,so it is a highly viscous liquid.while water is a relatively less viscous liquid as it offers extremely small resistance to any object passing through it.
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