Which feature characterizes the Calorie (Cal)?

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The Calorie (calorie) is defined as the amount of heat necessary to raise the temperature of 1 gram of water by 1°C at standard atmospheric pressure. This definition is equivalent to 4.184 joules. The Calorie is commonly used in nutrition to describe the energy content of food, and it is equal to 1,000 times the calorie. The kilocalorie (kcal), on the other hand, is equal to 1,000 calories or 1 Calorie. The Calorie and kilocalorie are both commonly used by countries that use the metric system.

Which Feature Characterizes the Calorie (Cal)