Principle:

Within DSC the heat flow is measure and plotted against temperature of furnace or time to get a thermogram. This is the primary of Differential Scanning Calorimetry (DSC). The curve obtained in DSC is between dH/dt in mJ ^s-1 or mcal ^s-1 as a function of time or temperature. A typical DSC curve is shown in Figure. The deviation observed above the base (zero) line is called exothermic transition and below is called endothermic transition.   An area under the peak is straight proportional to the heat evolved or absorbed through the reaction, and the height of the curve is straight proportional to the rate of reaction. Thus Eq. 1 is equally valid for DSC scheme also. The just one difference is the calibration factor K in case of DSC is independent of temperature. This is a main advantage of DSC over DTA.