In the kinetic analysis of thermal decomposition of the solid state, the writers have tried to express the reaction rate in the form, dα/dt=Zexp(-ΔE/RT)·f(α); f(α)=α^m(1-α)ⁿ[-ln(1-α)]^p proposed by Šesták and Berggren, using a series of DSC data under different heating rates.
This method has been applied to the thermal decomposition of magnesite, giving the following results; activation energy (ΔE), 37.9kcal mol^-1 (158.6kJ mol^-1); Frequency factor (Z), 1.29×10⁹; f(α)=α^5.7(1-α)^2.0[-ln(1-α)]^5.0. These values are supported by those obtained by the method of Achar, Brindley and Sharp, and are good agreement with literature data.

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An instrument of thermal desorption applicable to many fields only by replacing the adsorbent was constructed. Three fields of application were shown as examples.
(1) Gas chromatography which makes use of the difference of thermal desorption temperature of gases adsorbed on the quartz surface. It was shown that a mixture of n-hydrocarbon gases upto C₁₆ is separated to each component.
(2) Estimation of cleanness of amorphous surface, based on the fact that with a cleaned surface, the thermal desorption curve of a gas shows a single peak, while without baking procedure, it shows an unstable broad peak along with the original peak.
(3) Estimation of critical surface tension γ_c, from the measurement of thermal desorption temperature T_d. It was found that T_d of water increases monotonically with γ_c of the adsorbent polymer.

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A method of heat calibration is given for the previous apparatus of thermoanalytical microscopy and the heat of fusion of stearic acid was measured, which was used as the standard substance in the previous papers. The experimental result agrees with the most reliable value in the published references.

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