Simultaneous Thermogravimetric Analysis is a method in which thermogravimetry and differential thermal analysis are combined and measured simultaneously by a single apparatus.

Thermogravimetry (TGA) is a technique that measures mass change in a sample as a function of time and temperature, and it is used to detect evaporation, decomposition, oxidation and other effects of temperature change that cause mass changes.

Differential Thermal Analysis (DTA) measures the temperature difference between a sample and a reference as the temperature is increased. Changes in the sample, either exothermic or endothermic, can be detected relative to the inert reference. Thus, a DTA curve provides data on the transformations that have occurred, such as glass transitions, crystallization, melting and sublimation.