Question

Why do gaseous fuels have high calorific value?

Answer 1

Calorific value is defined as the amount of heat energy produced on complete combustion of 1 kilogram of a fuel. The higher the calorific value of a fuel, the more is its efficiency. The calorific value of gaseous fuels are more. When a gaseous fuel burns, it gives off a great deal of energy.

Gaseous fuels have higher calorific values because of the following reasons

1. There remains no unburnt waste in gaseous fuels unlike solid and liquid fuels.
2. Whether solid or liquid, combustion occurs when volatile solid of liquid under high temperature converts to gas, so some energy is wasted to get the solid and liquid converted into gas. This loss is not there in gaseous fuels.