A. Because it gives out a much greater quantity of heat in the same space of time; and the influx of heat is, therefore, more perceptible.
Q. Why does money in our pocket feel so hot, when we stand before a fire?
A. Metal is an excellent conductor; and, therefore, becomes rapidly heated. For the same reason it becomes rapidly cold, when it comes in contact with a body colder than itself.
Q. Why does a pump-handle feel intensely cold in winter?
A. As metal is an excellent conductor, when the hot hand touches the cold pump-handle, the heat passes rapidly from the hand into the iron; and this rapid loss of heat produces a sensation of intense coldness.
Q. Is the iron handle of the pump really colder than the wooden pump itself?
A. No; every inanimate substance (exposed to the same temperature) possesses the same degree of heat.
Q. Why then does the iron handle seem so much colder than the wooden pump?
A. Merely because the iron is a better conductor; and, therefore, draws off the heat from our hand much more rapidly than wood does.