%A"Lemarechal, A [Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires]" %D1963 %I; CEA Saclay, 91 - Gif-sur-Yvette (France) %2 %J[] %K07 ISOTOPES AND RADIATION SOURCES, CONVECTION, EXTRACTION COLUMNS, GASES, ISOTOPE RATIO, ISOTOPE SEPARATION, LIQUIDS, TEMPERATURE GRADIENTS, THERMAL DIFFUSION %PMedium: ED; Size: 44 pages %TThermal diffusion (1963); Diffusion thermique (1963) %XThis report brings together the essential principles of thermal diffusion in the liquid and gaseous phases. The macroscopic and molecular aspects of the thermal diffusion constant are reviewed, as well as the various measurement method; the most important developments however concern the operation of the CLUSIUS and DICKEL thermo-gravitational column and its applications. (author) [French] Ce rapport rassemble les principes essentiels de la diffusion thermique en phase liquide et en phase gazeuse. Les aspects macroscopique et moleculaire de la constante de diffusion thermique sont passes en revue ainsi que ses differentes methodes de mesure; mais les developpements les plus importants concernent le fonctionnement de ls colonne thermogravitationnelle de CLUSIUS et DICKEL et ses applications. (auteur) %0Technical Report %NCEA-R-2315;TRN: FR06R2315110074 %1 %CFrance %Rhttps://doi.org/ TRN: FR06R2315110074 FRN %GFrench