700 A 600 500 Pressure reeded to (edx) liquify iso-butane at 400 room temperature 300 200 Normal boiling point of iso-butane 100 0 -50-40-30 -20 -10 0 10 20 30 40 50 Temperature (C) Vapor pressure data from:E.W.Lemmon,M.O.McLinden and D.G.Friend,"Thermophysical Properties of Fluid Systems"in NIST Chemistry WebBook,NIST Standard Reference Database Number 69,Eds.W.G.Mallard and P.J.Linstrom,November 1998,National Institute of Standards and Technology,Gaithersburg MD,20899 (http://webbook.nist.gov). 上游充通大 March 12,2019 16 SHANGHAI JLAO TONG UNIVERSITYMarch 12, 2019 16 Vapor pressure data from: E.W. Lemmon, M.O. McLinden and D.G. Friend, "Thermophysical Properties of Fluid Systems" in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Eds. W.G. Mallard and P.J. Linstrom, November 1998, National Institute of Standards and Technology, Gaithersburg MD, 20899 (http://webbook.nist.gov). A