W/M.K是什么单位？

这个是热导率 1千卡(米2?时?℃)[kcal/(m2?h?℃)]=1.16279瓦/(米?开尔文)[W(m?K)] 1英热单位/(英尺2?时??)[Btu/(ft2?h??)]
=1.7303瓦/(米?开尔文)[W(m?K)]