International temperature scales Thermodynamic temperature:reversible cycles,imagination (Theoretical) Const.V gas thermometer Kelvin scale (Practical) standard International Temperature Scale (ITS) (1927) revision Most recent:ITS-90 (1990) (Based on temperatures of reproducible fixed points interpolation) 0.65 to 5.0 K:helium-3/helium-4 vapor pressure 3.0 to 24.5561 K:helium const.V thermometer 13.8033 to 1234.93K:platinum resistance thermometers >1234.93 K:Planck's equation for blackbody radiation... 上游充通大 April 17,2018 12 SHANGHAI JLAO TONG UNIVERSITYApril 17, 2018 12 International temperature scales • Thermodynamic temperature: reversible cycles, imagination (Theoretical) • Const. V gas thermometer = Kelvin scale (Practical) standard International Temperature Scale (ITS) (1927) revision Most recent: ITS-90 (1990) (Based on temperatures of reproducible fixed points + interpolation) 0.65 to 5.0 K: helium-3/helium-4 vapor pressure 3.0 to 24.5561 K: helium const. V thermometer 13.8033 to 1234.93K: platinum resistance thermometers >1234.93 K: Planck's equation for blackbody radiation…