当两个温度不同的物体接触时,热量将从高温物体流向低温物体。热量流动的净结果永远是向低温方向进行。热量传递的机理有三种:热传导、热对流和热辐射。

When two obiects at diferent temperatures are brought into contact, heat flows from the object at the higher temperature to thatat lower temperature. The net flow is always in the direction of the temperature decrease. The mechanisms by which the heatmay flow are three: conduction, convection, and radiation.