Definition of the Kelvin scale Te rev Ta Absolute temperature scale cycle Temperature at triple point of water:273.16 K T -->W T=273.16 Qtp reversible rev cycle 273.16K T→0(absolute zero; 0 K means Q=0,violate the 2nd law (Kelvin-Planck T <0 not defined,not possible; Smaller Q→small T; 上游充通大 April 17,2018 11 SHANGHAI JIAO TONG UNIVERSITYApril 17, 2018 11 Definition of the Kelvin scale Temperature at triple point of water: 273.16 K 273.16 K T Q Qtp reversible • T0 (absolute zero); • 0 K means Q = 0, violate the 2nd law (Kelvin–Planck ) • T < 0 not defined, not possible; • Smaller Q small T; Absolute temperature scale W