Einige Probleme im Zusammenhang mit der direkten Bestimmung der spezifischen Wärmen mittels Differential Scanning-Kalorimetrie

The relation between sample mass andDSC-amplitude was investigated under various experimental conditions for vitreous quartz, both as discs and powders. Contrary to other authors³ proportionality has been found up to the highest masses (75 mg) used. A statistical analysis of the data indicates that the accuracy of directC _p-measurements byDSC can be increased by determining the blank value by extrapolation of the amplitudes for several masses to zero mass instead of using the usual procedure, which involves a run with the empty pans. The overall error ofC _p due to instrument errors is estimated not to exceed 2%.