Write the old and new definition of calorie.

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(N/A) The old definition of a calorie is the amount of heat energy required to raise the temperature of $1 \ g$ of water from $14.5 \ ^\circ C$ to $15.5 \ ^\circ C$ at a pressure of $1 \ atm$.
The new definition of a calorie is defined in terms of the Joule,which is the $SI$ unit of energy. One calorie is exactly equal to $4.184 \ J$.

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