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VI. Answer in briefly1. Define one calorie.2. Distinguish between linear, arial and superficial expansion.

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1. Define one calorie ?
ans :- 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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