Thermogravimetric analysis (TGA) data for vaporization of CO2(g) from CaCO3(s) and vaporization of ZnCl2(1) are analyzed using theory from the transpiration method. Transpiration theory uses coupled diffusive and hydrodynamic flow. Temperature dependence of the TGA data yields reliable values for Delta(vap)H(theta). Analyses of the TGA data show that the viscosity coefficient has no significant effect. Fitting of experimental data at different flow rates of carrier gas yields the diffusion coefficient parameter and an experimental vaporization coefficient alpha(vap). The experimental vaporization coefficient has contributions from a true vaporization coefficient and from desaturation associated with the apparatus design.