HEAT-CAPACITY MEASUREMENT WITH A HEAT-FLOW CALORIMETER

This paper deals with a new quasi-isothermal method for the measuremen t of heat capacities of pure solids and liquids in an LKB 2277 heat fl ow microcalorimeter TAM (thermal activity monitor). Deviations of less than 1% from literature data can be achieved. It is shown that even e xcess heat capacities of binary mixtures can be determined. With a qua si-isothermal method, no heating up or cooling down of the calorimetri c unit is needed; thus the temperature of the thermostat directly repr esents the test temperature.