Newtonian and non-Newtonian applies to liquids not fluids.
Liquid is a fluid but fluid is not necessarily a liquid.
Fluids are liquid, vapour, gas and plasma.
Water is a Newtonian liquid; the viscosity is constant, at
constant temperature irrespective of shear.
Ketchup is a non-Newtonian liquid; the viscosity varies
depending upon the shear and the length of time the shear
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