THERMOMETRY AND CALORIMETRY
2005; Elsevier BV; Linguagem: Inglês
10.1016/b978-044451954-2/50012-6
Autores Tópico(s)thermodynamics and calorimetric analyses
ResumoThis chapter provides a brief methodical classification of thermometry and calorimetry. The method in which the heat is transferred through a thermocouple system is often called Tian–Calvet calorimetry. A specific group consists of isoperibolic calorimeters, which essentially operate adiabatically with an isothermal jacket. There are other versions such as the throw-in calorimeter, where the sample is preheated to high temperatures and then dropped into a calorimetric block, and combustion calorimeter, where the sample is burned in the calorimetric block. A separate field forms enthalpiometric analysis, which includes liquid flow-through calorimeters and thermometric titrations lying beyond this brief introduction. A thermometric procedure, which is quite similar to the convenient relaxation calorimetric method for measuring heat capacities, is the pulse-heating technique. The popular technique of differential thermal analysis (DTA) belongs among the indirect dynamic thermal techniques in which the change of the sample state is indicated by the temperature difference between the sample and geometrically similar inert reference held under identical experimental conditions. The advantage of this widely used method is a relatively easy verification of differences in the thermal regimes of both specimens, and the determination of zero traces during the test measurements, currently replaced by inbuilt computer programming.
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