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nature : the International System of Units of the seven basic volume one of the T symbol. According to thermodynamic principles drawn. Measurement of thermodynamic temperature, using international practical temperature scale. The international practical temperature scale on which the international community through a series of pure substances fixed point (such as three-phase hydrogen balance, balance of the boiling point of hydrogen, oxygen three-phase, three-phase water, the freezing point tin, etc.) as a benchmark for the calibration of benchmarks thermometer (such as platinum and platinum resistance thermometer -10% rhodium / platinum heat Galvanic, etc.) and gives the corresponding interpolation formula for the determination of temperature. Units of Kelvin, or open, symbols K. The definition of open water Triple Point ADNRs thermodynamic temperature. And to express degrees Celsius temperature, instead of opening a specialized name. As open as a unit equivalent to a ° C said the temperature difference in the temperature interval and, with open and use the same numerical ° C The thermodynamic temperature T Celsius temperature and the relationship between t : t = T-273.15K. Formerly thermodynamic temperature absolute temperature (absolute temperature).
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