Heat may be transferred from one body to the other by any of three possible ways: conduction, radiation and convection. In the conduction, convection phenomena, a medium is necessary for the heat transfer. Radiation, however, does not have this limitation. This is also the fastest type of heat transfer, in which heat is transferred from one object to the other in the form of electromagnetic radiation.

传导：图表示在温度下与热储层的热接触的杆T1and a cold reservoir at temperatureT2. The ends of the rod are covered with insulating medium, so the transport of heat is along the slit, not through the sides. The particles at the hot reservoir have greater vibration energy. This energy is transferred by attack to the atoms at

狭缝的末端。这些原子通过热量转化的物体转化，在没有直接质量传输的情况下传输热量，称为传导。

大多数金属需要另一种更有效的机制来传导能量。遍及整个金属的自由电子可以迅速从较热到较冷的零件中迅速吸收能量，因此金属通常是良好的热量导体。“游离”电子的存在也使大多数金属成为良好的电导体。在5°C下的金属棒似乎比5°C的一块木头还要冷，因为能量可能从您的手中更容易流入金属。

Heat transfer happens only between parts that are at different temperature, and the rate of heat flow is dQ/dt. This rate is also named the heat current, shown by H. Experiments give that the heat current is proportional to the cross-section area A of the rod and to the temperature gradient dT/dx, which is the rate of modification of temperature with distance along the bar.

H = dQ/dt=-kAdT/dx ... (1)

负符号用于创建DQ/DT，因为DT/DX为负，因此使用了正数。计算材料传导能力的恒定K，称为热导率。

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