What is heat? Explain.

Explanation

Heat is a form of energy.
Consider two identical balls of iron, one at `50^(@)C` and the other at `100^(@)C`. Of these one is hotter than the other. The relation between heat and work is
W=J.Q.
where 'J' is a constant known as the mechanical equivalent of heat. W = Work done, Q = Heat liberated. The values of J is `4.8xx10^(7)` ergs/calorie. In the C.G.S system mechanical work is measured in units of erg. Heat is measured in units of calorie. Thus `4.18xx10^(7)` ergs of work must be done to produce one calorie of heat.