A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc (Classic Reprint)

Heat is a form of energy. It is the effect of a motion of the molecules composing matter. It has been stated in Mechanics that all matter is composed of molecules; now, these molecules are not in a state of rest, but are moving or vibrating back and forth with a greater or less velocity, and it is this movement of the molecules that causes the sensations of warmth or cold. If the motion is slow, the body appears cold to the touch; when the vibrations are rapid, the body becomes warm or hot. 1971. It was shown in Mechanics that a body in motion has kinetic energy, the amount of which is measured in footpounds by multiplying the weight of the body by the square of its velocity and dividing by 64.32. Since the molecules composing matter are in motion, they must possess kinetic energy, and we are justified, therefore, in saying that heat is a form of energy. 1972. Temperature is a term used to indicate how hot or cold a body is; i. e., to indicate the rate of vibration of the molecules of a body. A hot body has a high temperature ;a cold body, a low temperature. When a body, as, for example, an iron bar, receives heat from any source, its temperature rises; on the other hand, when a body loses heat, its temperature falls. 1973. The temperature is not a measure of the quantity of heat a body possesses. Temperature may be considered to be a measure of the velocity of the molecules of a body as they vibrate to and fro, while the quantity of heat may 1F or notice of the copyright, see page immediately following the title page.
(Typographical errors above are due to OCR software and don't occur in the book.)

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