<P> Rheometers and viscometers work with torque and angular velocity . Since we normally work with shear stress and shear rates, a method is needed to convert from "instrument numbers" to "rheology numbers". Each measuring system used in an instrument will have its associated "form factors" to convert torque to shear stress and to convert angular velocity to shear rate . </P> <P> We will call the shear stress form factor C and the shear rate factor C . </P> <Dl> <Dd> Shear stress = C × torque </Dd> <Dd> Shear rate = C × angular velocity (*) </Dd> <Dd> Viscosity = shear stress / shear rate </Dd> </Dl> <Dd> Shear stress = C × torque </Dd>

Where is 3 4 located on a measuring cup