ABSTRACT
The mass is measured using a balance. A balance uses the physical principle of leverage: a sample is placed at the end of the arm while placing a reference weight in the opposite end and the weight is recorded as the change in force. In the TGA, the mass detection is based on the principle of substitution weighing introduced by Mettler in 1945 (Fig. 1). In the TGA shown in Fig. 1, the calibration weights and the sample are suspended from a single arm. The calibration weight is substituted as the sample mass substitutes for it. The weighing principle is still leverage.
