how is the calorie is related to joule?
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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.
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If we heat 1 kg of water by 1°C in different temperature range than 14.5 °C to 15.5°C, the amount of heat required will be slightly different.
It is, therefore, essential to define a specific temperature range while defining the unit of heat.
Calorie and Joule are related by following relation: 1 cal = 4.18 Joule
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