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The Measurement of Specific Heat

المؤلف:  GEORGE A. HOADLEY

المصدر:  GEORGE A. HOADLEY

الجزء والصفحة:  p-282

2025-11-25

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A convenient method of measuring the specific heat of a body is the method of mixtures. This depends upon the fact that when two bodies that are at different temperatures are put together, the temperature of one will fall and that of the other will rise until they have reached the same temperature. It also depends upon the principle that the heat absorbed by the cool body in heating is exactly the amount given out by the hot body in cooling. This principle is fundamental in all work in specific heat and may be stated in its simplest form as follows: Heat gained = Heat lost.

The quantity of heat absorbed by the cool body in heating = mass × change in temperature × specific heat. The quantity of heat given out by the hot body in cooling = mass × change in temperature × specific heat. That is,

EXAMPLE. - Two pounds of fine shot at 90° were poured into one pound of water at 15°, and the resulting temperature was 20°. What was the specific heat of the shot? From Formula 50, since the specific heat of water = 1,