Define one calorie? What is the other unit of energy? Write the mathematical relation between the two units of energy.

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Solution

One calorie is defined as the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere.
The SI unit of energy is Joule.
It is equal to the work done by a force of one newton acting through one metre.
The relation between Calorie and Joule can be numerically given as-
1 calorie = 4.2 joules

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