| 单词 | conductivity |
| 释义 | conductivity 1(thermal conductivity) A measure of the ability of a substance to conduct heat. For a block of material of cross section A, the energy transferred per unit time E/t, between faces a distance, l, apart is given by E/t=λA(T2- T1)/l, where λ is the conductivity and T2 and T1 are the temperatures of the faces. This equation assumes that the opposite faces are parallel and that there is no heat loss through the sides of the block. The SI unit is therefore J s-1 m-1 K-1. 2(electrical conductivity) The reciprocal of the resistivity of a material. It is measured in siemens per metre in SI units. When a fluid is involved the electrolytic conductivity is given by the ratio of the current density to the electric field strength. |
| 随便看 |
物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。