FIELD: investigating composition and properties of liquids.
SUBSTANCE: method includes filling a closed hollow cylinder with liquid to be investigated and setting it in rotation. The cylinder rotates until the liquid angular velocity in the cylinder reaches a constant value, then it stops instantaneously, and the relaxation time τr is measured between the first state, in which the liquid surface has the form of a paraboloid of revolution and its parameters are determined by the angular velocity of liquid ω1, and the second state, in which the parameters of the paraboloid of revolution are determined by the angular velocity ωpar. Time τr, which is necessary for the liquid to reach the second state (ω=ωpar), is a measure of viscosity and determined from the formula 
where k=15.4/a, a is the radius of cylinder, ρ is density, and γ is viscosity.
EFFECT: enhanced accuracy of determining viscosity.
1 dwg
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