In the choice of thermal conductivity materials, thermal resistance value is an important reference factor, which reflects the heat capacity of thermally conductive material, the smaller the thermal impedance of thermal conductivity material, the higher the thermal efficiency.

    Definition thermal impedance is resistance on the heat flow path of heat encountered, the unit is ℃ / W or K / W, 1W of heat that can cause temperature changes the size of the thermal conductivity of the material。
 
   Thermal conductivity, thermal resistance, thermal stability is to choose a major consideration material, high thermal conductivity thermal impedance high thermal conductivity material if the thermal effect is not ideal, the same, low thermal coefficient of thermal impedance low thermal conductivity material thermal efficiency poor, so the judge needs to integrate the thermal conductivity and thermal resistance when the two factors were considered low thermal conductivity material thermal efficiency.