Complexes GET 17/1–KVI and GET 17/2–KVN from GET 17–2018 State Primary Standard of Dynamic and Kinematic Liquid Viscosities

Abstract

Viscosity is the most important property of liquid medium, determining the quality, as well as the possibility of their processing and transportation. Viscosity measurements are performed in many industries to control technological processes in which viscosity is one of the controlled parameters of the final product. Accuracy of viscosity measurements is also necessary in medicine and biology to organize research for new materials.This review article raises issues of measuring liquid viscosity using the capillary method, reveals the factors and reasons justifying the emergence of the capillary method as the main method of high-precision measurements used in many countries.The author describes two standard complexes from GET 17–2018 State Primary Standard of Dynamic and KinematicLiquid Viscosities. The first is EK GET 17/1-KVI designed for reproducing, storing, and transmitting a unit of kinematic viscosity in the temperature range from 20 to 40 °C. The second is EK GET 17/2-KVN designed for reproducing, storing, and transmitting a unit of kinematic viscosity in the temperature ranges from –40 to +20 °C and from 40 to 150 °C. The focus is on the operating principle and main metrological characteristics of these reference complexes, as well as the results of international key comparisons involving them.In the future, the research materials may influence the development vector of means and methods for measuring liquid viscosity.