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The heat capacity of octafluorocyclobutane of 99.98,-mole-percent purity was de te rmined in an adiabatic calorimeter from lr to 270° J\:. The heat of fu sion is 2768 .2 ± 2.0 abs j mole-1 at the triple-point temperature of 232.96 ± 0.05° K . The three heat-ofvapori· zation experiments at t he vapor pressure of 590.9 mm Hg and 261.25° K gave an a,'erage value of 23721 ± 20 abs j moleI. Four solid-solid t ransitions \\'ere observed wi th th e heatcapaci ty peaks at 141.3 ± 0.2°, 174.6 ± 0.2°, 214 .84 ± 0.05°, and 216.99 ± 0.05° K . The anomalous behavior in the heat capacity at about 97 0 K , " ' here t he hea t capacity chan ges its slope abruptly , is attributed to g lass t ransforma tion. The vapor pressure \\'as measu red from 177 0 to 274 0 K . The results of this measurement from the trip le-po int te mperature to 2740 K ca n be represe nted within ± 0.5 mm Hg in mos t cases by the equation

Heat capacity, heats of transitions, fusion, and vaporization, and vapor pressure of octafluorocyclobutane