Bulletin of the Chemical Society of Japan · 1965 · 66 citations · 9 references
Natural SciencesChemistryAnalytical ChemistryInstrumentationThermodynamicsAnalytical CalibrationCalibrationCalorimetryEquipment CalibrationHeat Capacity MeasurementTemperature MeasurementAdiabatic CalorimetryHeat CapacityHeat Capacity At Low TemperaturesHeat Capacity CalibrationHeat Capacity DeterminationInstrument Calibration In CalorimetryPlatinum Resistance ThermometrySpecific Heat Determination
Abstract An adiabatic calorimeter for the measurements of the heat capacity of a solid and liquid over the temperature range from 13 to 300°K has been constructed. In order to minimize the operating manpower, all the temperature controls were recorded semiautomatically. The energy input was started and stopped automatically by a timer driven by a signal from a transistor clock. The working platinum resistance thermometer was calibrated against a laboratory standard thermometer which had been calibrated by the National Bureau of Standards. In order to verify the performance and the accuracy of this one-man-operated calorimeter, the heat capacity of a Calorimetry Conference Standard sample of benzoic acid crystal has been measured from 15 to 310°K. The results have compared with the data from the NBS and from other laboratories; this comparison served to establish the reliability of this equipment. The estimated errors are ±2% at 20°K, ±1% below 50°K, and ±0.3% above 50°K.
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