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Conduction

Heat can also be transferred from one object to another, or from one molecule to another through the process of conduction. As one molecule is heated it begins to move and shake rapidly. As it does so, it passes some of its heat energy to other molecules around it. Through this process, all the molecules of an object pass heat from one to another until they are all hot.

Returning to the example of a camp fire: What happens if we use an old metal hanger to roast hotdogs? As the hotdog cooks, the fire heats the end of the hanger. If we leave the hanger in the fire long enough, eventually the end we are holding will become too hot for us to handle. This happens despite the fact that this end was never placed into the flames. Heat was transferred from the flames to the metal, and then from molecule to molecule in the hanger via conduction until it reached your sensitive fingers.

Conduction

Not all objects are good conductors of heat. In our example above, what would happen if you had chosen a stick to roast your hotdog on instead of a metal hanger? Though the stick may have caught fire, it would not have conducted the heat to your hand. This is because wood is a very poor heat conductor.