Apparent viscosity (sometimes denoted η) is a rheological property calculated from rheometer readings performed by a Mud engineer on drilling fluid. It is normally abbreviated as AV. It is expressed in cP (centipoise). Centipoise is the amount of force required to move one layer of fluid in relation to another. One centipoise is equal to one hundredth of a poise. A more conventional unit is the SI derived unit mPa·s (millipascal-second; 1 mPa·s = 1 cP).
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