精选优质文档-倾情为你奉上2. Conduction（导热） The best heat-insulating solids own their insulating properties to the air or to other gases contained in cells within the material.（最好的隔热材料在空气和材料细胞中拥有自己的绝热性能。） These cells cause the heat to flow through the solid material through a long tortuous passage. （这些细胞使热量需要通过一个漫长曲折的通道才能流过这个坚实的固体。） In addition, the available cross-sectional area of the solid material is much less than the projected area. （另外，见识的固体材料可用的横截面面积比投影面你少得多。） Experimental evidence
