![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
导热系数λ是在温差1K时,每秒通过面积为1m2、厚度为1m物料层的热量。热量的单位是J。因此λ的单位为J/(m·s·K),即W/(m·K). The coefficient of thermal conductivity is the heat that passes through a material layer of 1m2 or 1 meter thickness per second at 1K temperature difference. Heat is in joules. Lambda is equal to J over m sub K, which is equal to W over m sub K.