| 单词 | thermal diffusion |
| 释义 | > as lemmasthermal diffusion thermal diffusion n. diffusion occurring as a result of the thermal motion of atoms or molecules, esp. as a technique for separating gaseous compounds of different isotopes of an element (which diffuse at different rates in a temperature gradient). ΘΚΠ the world > matter > physics > mechanics > fluid mechanics > [noun] > diffusion > specific interdiffusion1864 thermal diffusion1916 the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > diffusion thermo-diffusion1899 thermal diffusion1916 1916 S. Chapman in Proc. Royal Soc. A. 93 10 We may call D12, D12′, Dp, and DT respectively the coefficients of diffusion, forced diffusion, pressure diffusion, and thermal diffusion. The definition of D12 agrees with that usually given for the coefficient of diffusion. The other coefficients seem to be defined here for the first time. 1962 Newnes Conc. Encycl. Nucl. Energy 357/2 The separations achieved in a convection~free system are small, and are only used to determine the magnitude of the thermal diffusion effect and to provide information on intermolecular force fields. < as lemmas |
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