Chapter 20, Problem 85A

Interpretation Introduction

Interpretation:

Give the definition of a calorie and its relation with joule.

Concept introduction:

Calorie is a unit used for measuring heat energy.

Answer to Problem 85A

One calorie is defined as the amount of heat energy required to increase the temperature of 1 g of water by 1 $°C$. Calorie, calorie and joule are related by the following equation:

$\begin{array}{l}1cal=4.2J\\ 1Cal=1000cal\end{array}$

Explanation of Solution

1 Calorie carries thousand times more energy than calorie and 1 calorie carries 4.2 times more energy than joule which leads to the following equations:

$\begin{array}{l}1cal=4.2J\\ 1Cal=1000cal\end{array}$

Conclusion

Calorie is a unit of heat energy and its relation with the units of Calorie and joule have been described above.