Viscosity is a measure of the flow of a liquid material. It measures the amount of force required to deform (strain) a liquid a given distance.

Viscosity is commonly perceived as "thickness", or resistance to flow. Thus, water is "thin", having a lower viscosity, while molasses is "thick" having a higher viscosity. The study of viscosity is known as rheology.

Epic uses test methods ASTM D2196 and D4287.

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