Abstract
An improved Bunsen ice calorimeter has been constructed and calibrated for use in measuring critical region heat capacities. A novel method for continuously monitoring the weight of the mercury displaced by using a flexible capillary between the calorimeter and an analytical balance makes possible greater precision, easier operation, and wider applicability of the ice calorimetric method. An improvement in the method of thermostating the calorimeter allows higher precision over long period heat measurements. The measured electrical calibration factor of 270.45±0.03 J/g Hg agrees satisfactorily with previous very careful calibrations and the observed precision of ±0.011 J/g Hg is easily attainable during electrical calibrations. Relatively simple improvements in other aspects of the calorimeter are suggested for increasing both the precision and accuracy significantly.
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