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where h is the height of immersion in metres of the cylinder made to revolve in the liquid medium, RA and RB are the radii in metres of the cylinders, RA being smaller than RB, and œ is the angular velocity in radians per second. The constant k of the apparatus^ may be determined at various speeds of rotation using a suitable viscometer calibration liquid. The viscosity then corresponds to the formula:

Method. Measure the viscosity according to the instructions for the operation of the rotating viscometer. The temperature for measuring the viscosity is indicated in the monograph. For pseudoplastic and other non-Newtonian systems, the monograph indicates the type of viscometer to be used and the angular velocity or the shear rate at which the measurement is made. If it is impossible to obtain the indicated shear rate exactly, use a shear rate slightly higher and a shear rate slightly lower and interpolate.

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Supplements For Diabetics

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