State system for ensuring the uniformity of measurements. Standard reference data. Chlorine, liquid and gaseous. Density at temperatures from 172,17 K to 440 K and pressures up to 20 Mpa
Interstate system for ensuring the uniformity of measurements. Weight amounts of the standard materials for preparation of the buffer solutions - operational pH standards of 2-nd and 3-rd classes. The technical and the metrological characteristics. Methods of them
