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Viscometer. Various laboratory instruments, also known as viscosimeters, for estimating the viscosity (q.v.) of a fluid or suspension (q.v.) by either forcing a specific volume of it through a standard-size orifice under a constant pressure and recording the time required to accomplish this, or by registering the resistance offered to a rotating spindle or disc inserted into a sample of the fluid substance or its suspension. The latter type is used extensively to follow the viscosity behavior of starches (q.v.) during a heating and cooling cycle to evaluate their suitability for certain food and industrial applications.