In a redwood viscometer, A and B are constants used in the formula to calculate the viscosity of the fluid being tested. The formula is viscosity = A + B * time in seconds. The values of A and B are specific to the design of the redwood viscometer and are typically provided by the manufacturer.
REDWOOD'S Viscometer is used to find out the viscosity of an standard rape oil and any of the fluids . The viscometers are classified into 4 types they are 1. Saybolt Viscometer 2. Engler Viscometr 3. Barbey Viscometer & 4. Redwoods Viscometer
Because it is the most convenient device as far as protection and accuracy is concerned.
The redwood viscometer was invented by Norman Henry Redwood, a British chemist and engineer, in the late 19th century. It was designed to measure the viscosity of liquids, particularly petroleum and related products.
A standard British-type viscometer in which the viscosity is determined by the time, in seconds, required for a certain quantity of liquid to pass out through the orifice under given conditions; used for determining viscosities of petroleum oils.
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time was not calculated at the right point so the poits of the graph were chaned
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SO that the oil cup gets uniformly heated from all the sides
There are several methods. Most use the time it takes, for a standard measured volume to pass through a small hole. It takes the form of a viscosity cup, which holds the required amount and has the standard sized hole at the bottom. Seal the hole with your finger, pour liquid in upto the mark, let go your finger at the same time as starting a stopwatch. Stop the watch when the stream first breaks. Viscosity is measured in seconds (redwood scale)
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