Aem Lect14

This document discusses several types of viscometers used to measure viscosity, including rotational viscometers, cone and plate viscometers, and falling ball viscometers. Rotational viscometers measure viscosity by sensing the torque resistance of a spindle rotating in a fluid sample at constant speeds. Cone and plate viscometers measure the torque required to rotate a cone in highly viscous fluids and pastes at varying angular velocities. Falling ball viscometers time the fall of a ball between marks in a temperature-controlled fluid sample to calculate viscosity.