Modernized state primary standards of the units of thermal quantities

The content and results of efforts to modernize the three State Primary Standards of the units of temperature in the 0–3000°C range and also of the standards of thermal conductivity and coefficient of linear expansion of solids, stored at the Mendeleev Research Institute of Metrology, are described. It is shown that, simultaneously with the modernization of the standards, the systems of transmitting the dimensions of the units of the standards to working measuring instruments have also been improved.