Copper is the best conductor of heat, having about 7 times the conducting power of iron, while iron conducts 100 times as well as water, and water has 25 times the conductivity of air.

铜是最好的热传导体，其导热能力约为铁的7倍，铁的导热能力是水的100倍，而水的导热能力是空气的25倍。