A combined vapor-flow calorimeter, modified after the Pitzer's vapor-flow calorimeter and the Newsham's vaporization flow calorimeter is described. The calorimeter was used to determine heats of vaporization under different pressures and vapor heat capacities from boiling temps. up to 200癈 for organic compounds and their mixtures The calorimeter was calibrated with benzene, with an accuracy of <0.5% for the heat of vaporization and that of about 1% for the vapor heat capacities.f

Key words: THERMODYNAMIC PROPERTIES, BENZENE, SPECIFIC HEAT, GAS FLOW, VAPORIZATION HEAT, COLORIMETRIC DOSIMETERS