Thermogravimetric Analysis measure changes in weight of a sample with increasing temperature. Measurements are used primarily to determine the composition of materials and to predict their thermal and oxidative stability. Also the technique is used to estimate the lifetime of a product, decomposition kinetics, moisture/volatile content, melting point, glass transition, heat capacity, crystallinity and purity. When coupled to mass spectrometry, the species that evolve as a result of a temperature increase, are conducted to a mass spectrometer, and its identity can be identify, giving information about reactions in real time. The resolution of the technique is affected by the heating rate, sample size and purge gas composition.