The procedure and precision values for residual fuel oils, which under some conditions exhibit non-Newtonian behaviour, have been included. If, however, the viscosity varies significantly with the rate of shear, different results can be obtained from viscometers of different capillary diameters. NOTE The result obtained from this document is dependent upon the behaviour of the sample and is intended for application to liquids for which primarily the shear stress and shear rates are proportional (Newtonian flow behaviour). usage, stoke is sometimes used as the singular form. The range of kinematic viscosities covered in this test method is from 0,2 mm 2/s to 300 000 mm 2/s over the temperature range ?20 ☌ to +150 ☌. The SI unit of kinematic viscosity is square meter per second (m 2 /s), whereas the CGS unit for kinematic viscosity is the stokes (St, or cm 2 s 1 0.0001 m 2 s 1), named after Sir George Gabriel Stokes. Using this testing method, changes in viscosity at different temperatures and under differing.

The dynamic viscosity, η, is obtained by multiplying the measured kinematic viscosity by the density, ρ, of the liquid. Testing lubricating oils is a significant application. This document specifies Procedure A, using manual glass viscometers, and Procedure B, using glass capillary viscometers in an automated assembly, for the determination of the kinematic viscosity, ν, of liquid petroleum products, both transparent and opaque, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer. ASTM D445 Kinematic Viscosity This test method specifies a procedure for the determination of the kinematic viscosity,, of liquid petroleum products, both transparent and opaque, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer.

Kinematic viscosity testing