Temperature scales Temperature scales are chosen so that T=a+bP For Celsius scale,assign T 0C>freezing point of water at 1 atm 100 C>boiling point at 1 atm Measured Absolute Temperature Scales data points Gas A For absolute scales assign Gas B a=0° Extrapolation Gas C Gas D Then,for a given ideal gas,P→0，T→0 (0.000000002Kin1989) -273.15 0 T(C) 上游充通大 February 28,2019 17 HANGHAI JLAO TONG UNIVERSITYFebruary 28, 2019 17 Temperature scales Temperature scales are chosen so that T = a + b P For Celsius scale, assign 0 ̊C  freezing point of water at 1 atm 100 ̊C  boiling point at 1 atm Absolute Temperature Scales For absolute scales assign a = 0˚ Then, for a given ideal gas, P0, T0 (0.000000002 K in 1989)