Thermogravimetric analysis (TGA) measures how the weight of a material changes as it is heated. During TGA, a sample is heated at a controlled rate while measuring its weight change. Physical changes like phase transitions and chemical changes like decomposition can be identified by changes in the weight of the sample over temperature. TGA curves plot weight change versus temperature. TGA is used to determine material properties over a range of temperatures, characterize materials and chemical compositions, and identify reaction kinetics. The sample environment, heating rate, and sample size can affect TGA results. Common applications include determining purity and thermal stability, analyzing complex mixtures, and studying catalysts.