Abstract
Thermogravimetric analysis (measurement of sample mass vs. temperature) is a frequently used laboratory technique in the analysis of materials, and commercial computerautomated equipment is available. The TGA experiment is designed in much the same way as a transpiration experiment; the transpiration experiment was theoretically analyzed using a transport mechanism coupling diffusion and viscous flow. This coupled flow analysis as applied to the TGA experiment will be discussed. The analysis allows one to calculate equilibrium vapor pressures and related thermodynamic properties. As an example, data for the vaporization of Tl 2O 3(s) will be discussed.
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