Question

The amount of heat required to raise the temperature of 1 g water by 1 °C is 
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Answer 1

Explanation:

The calorie is defined as the amount of energy (heat) needed to increase the temperature of one gram of water by 1°C. The SI energy unit is the joule. 1 Calorie = 4.186 joule.

Answer 2

Explanation:

The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.