Thursday 20 December 2007

Feel of Metal

Why does metal feel cold?

When you touch something made of metal, it feels cold. The reason for this is that some heat flows from your fingers into the surface of the metal. Because the skin on your fingers loses heat, it gets cold and the metal feels cold.
Metal objects feel cold in a cool climate because metal is a good conductor of heat. This means that heat flows through metal easily. Heat, therefore, leaves the skin of your fingers and flows into the metal. It does this because your fingers are warmed than the metal. The heat moves on through the metal, so that the surface of the metal does not get as warm as the skin on your fingers. Heat continues to flow from your fingers into the metal, and it feels cold.
Wood or cloth are poor conductors of heat. The surface of an object made of wood or cloth quickly warms up as you touch it, and it does not feel cold.

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