What is meant by the calorific value of a fuel? How is it determined?

What is meant by the calorific value of a fuel? How is it determined? Arrange the following fuels in a decreasing order of their calorific values. Kerosene, Coal, LPG.

The amount of heat produced in burning the unit mass of a fuel completely is known as the calorific value of that fuel. It is determined with the help of bomb colorimeter. Arrangement of the fuels in a decreasing order of their calorific values:
LPG > Kerosene > Coal.