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A non-SI unit of energy defined as the amount of heat required to raise the temperature of one gram of pure water by one degree (from 14.5 to 15.5 C or from 287.65 to 288.65 K) under standard conditions with the specific heat of the water at 15 degrees Celsius and the constant pressure of 101.325 kPa or one atm being defined as unity. A value recorded by ISO for the calorie at 15 degrees Celsius is 4.1855 J. According to the current national standard in the United States (IEEE/ASTM SI 10TM 2002. American National Standard for Use of the International System of Units (SI): The Modern Metric System, New York: IEEE, 2002) the calorie in any form is not to be used. Joules should be used instead.
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