一、引言导热系数是和物质性质有关的特性数据,但外界条件(如温度、压力)也影响其量值。作为物质的一个特性,可以找出它与其它一些特性(如物质的分子量、比热、密度、粘度、汽化热,甚至在物质中传播的声速等)之间的关系。借助这些经验的 I. INTRODUCTION Thermal conductivity is characteristic data related to the nature of matter, but external conditions (such as temperature and pressure) also affect its magnitude. As a property of matter, one can find out its relationship with other properties such as molecular weight, specific heat, density, viscosity, heat of vaporization, and even the speed of sound propagating in matter. With these experiences