Consistometer

Article summary

A consistometer is a device for measuring the physical consistency of a substance. It is most often used for foods such as ketchup and other thick fluids or semi-fluids. Consistency is typically measured in terms of rate of flow, as opposed to viscosity which is measured in regard to force within units like poise. Consistometry readings can roughly correspond with viscosity measurements, but some substances such as carob flour have little to no effect on consistometer flow but can increase apparent viscosity. People's sensory perception of a food seems to track more with the consistency than the viscosity. Using a consistometer is also useful on non-homogeneous substances that would give poor readings with a viscometer. One of the most common types is the Bostwick consistometer which was invented by bacteriologist (1893–1958). This device consists of a rectangular container with two sections: one of a set volume and the other at a slight decline with centimeter measurements along the bottom. Dividing the two sections is a sluice gate that can be sprung quickly open, allowing the substance to flow under its own weight. The distance traveled is noted at a specific time, typically thirty seconds, and compared to known samples. A Bostwick consistometer is relatively easy to use in remote locations without electricity and is much cheaper than a viscometer.…

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