Question

Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with the highest calorific value first):
Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane

Answer 1

The calorific values of the given fuels are given below:

Hydrogen gas: 150 kJ/g
Methane. 55 kJ/g
petrol. 50 kJ/g
Kerosene 48 kJ/g
Biogas. 35-40 kJ/g
Wood. 17 kJ/g

Thus, the fuels in the order of decreasing calorific values (keeping the fuel with the highest calorific value first) are shown below:

Hydrogen gas > Methane > Petrol > Kerosene > Biogas > Wood.