| 单词 | thermal diffusivity |
| 释义 | > as lemmasthermal diffusivity thermal diffusivity n. the thermal conductivity of a substance divided by the product of its density and its specific heat capacity. ΘΚΠ the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > capacity for > ratio thermal diffusivity1880 Wiedemann–Franz law1901 Wiedemann–Franz ratio1966 1880 W. Thomson in Encycl. Brit. XI. 581/2 It is k/c, not merely k, that expresses the quantity of the substance on which the phenomenon chiefly depends. We therefore propose to give to k/c the name of thermal diffusivity. 1973 J. G. Tweeddale Materials Technol. I. iv. 95 Thermal diffusivity (a) is important when it is necessary to consider the effects of temperature differences set up in a material during transfer of heat. 1973 J. G. Tweeddale Materials Technol. I. iv. 95 Both thermal conductivity and diffusivity cease to have much meaning for the liquid state since in that state the principal mechanism of transfer becomes convective mixing. < as lemmas |
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