Conduction (Fig. 15-6) is the flow of heat through a solid material, as opposed to radiation, which takes place through a transparent gas or a vacuum. Molecules vibrating at a faster rate (at a higher temperature) bump into molecules vibrating at a slower rate (lower temperature) and transfer energy directly to them. The mol

ecules themselves don't travel to the other object; only their energy does. When a hot pan comes in contact with our skin, the heat from the pan flows into our skin. When the object we touch is cold, like an iced drink in a cold glass, the heat flows from our skin into the glass. Conduction is responsible for only a small amount of the heat loss from our bodies. Conduction can occur within a single material, when the temperature is hotter in one part of the material than in another.

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