State system for ensuring the uniformity of measurements. Parameters of ultrasonic fields. General requirements to measuring methods and characterization of fields in the frequency range 0,5 to 40 MHz
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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