干空气的物理性质ρ/kg·m-3cp/kJ·kg-1·K-1λ/10-2W·m-1·K-1μ/10-5Pa·s温度t/℃密度比定压热容导热系数粘度普兰德数Pr-501.5841.0132.0351.460.728-401.5151.0132.1171.520.728-301.4531.0132.1981.570.723-201.3951.0092.2791.620.716-101.3421.0092.361.670.71201.2931.0092....