An adiabatic constant-flow calorimeter previously used was modified to improve it accuracy. The heat capacity of gaseous oxygen was measured at -30, + 40, a nd + 90 C, and th e results were compared with values calculated from spec troscopic data. The expe rimental an d spectro copic values agreed within 0.04, 0.02, and 0.11 p ercent at th e three temperatures. The hea~ capacity of isobutane was m eas ured at -30, + 0, + 40, and + 80 C. A few measurements were made on I -butene at 40 and 90 C. Meas urements on the hydrocarbons at two or more press ures p ermitted the calculation of value of (02 V / o 'l'2)p.
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Wacker et al. (1947) studied this question.