Gas-fired central heating boilers, type B boilers, of nominal heat input exceeding 70 kW, but not exceeding 300 kW. The general technical requirements and test methods
State system for ensuring the uniformity of measurements. Standard reference data. Parahydrogen, liquid and gaseous. Density, enthalpy, entropy, isochoric, isobaric heat capacities and speed of sound at temperatures from 14 K up to 1000 K and pressures up to 100 MPa
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