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Woodley Wonderworks APPENDIX 12
The heat content of a substance can be calculated by using the following equation:
When two materials having different temperatures are mixed together, the hotter material loses energy and the cooler material gains energy. The total amount of energy gained equals the total amount of energy lost. This first law of thermodynamics can be expressed by the following equation:
Example: A 30-gram piece of metal at 90°C is placed in 50 ml (50 grams) of water at 25°C. After a short time, the temperature of both metal and water is 35°C. On the basis of these measurements and the fact that the specific heat (energy required to raise the temperature of one gram matter one degree Celsius) for water is 1 cal/g·°C, what is the specific heat of the metal?
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