الفهرس 
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Abstract
The thesis presents an experimental study of the performance of a glass - hot - wire thermal diffusion column for gaseous mixtures. An equimolar mixture of nitrogen and argon is chosen for this study. The measurements are carried out using a column whose dimensions are : r1 = 0.60 cm., r2=0.01 cm., L = 99.0 cm. The equilibrium separation factor Q is measured as a function of pressure for six values of T2/T1 ranging from 2.26 to 3.87. The temperature of the cold surface is kept constant at 302 K.