当发热与散热相等时即达到平衡状态，温度不再上升而稳定在一个水平上。
When the heat is equal to the heat dissipation, the equilibrium state is reached, and the temperature does not rise up to a certain level.
金属导体中有电流通过时就要发热，从而导致此导体的热膨胀，使原子的状态发生了变化。
In the metallic conductor has the electric current passes obsolete must give off heat, thus creates the conductor thermal-expansion, this originally was the atomic condition occurs the change.
自动休眠，热风焊台手柄放置焊台架上，机器将自动进入休眠状态，节省能源，延长发热体的使用寿命。
The system enters the standby mode when the handle come back to the holder. It can save the energy and extend the life of heating element.
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