"Biogas is better fuel than animal cow dung cakes " justify this statement stating three reasons.

1. biogas has comparitively higher calorific value(energy which can be obtained by same amount of fuel) than cow dung

2.biogas is easy to store but cow dung cakes arre inconvinient to store

3.biogas burns smoothly but cow dung cakes do not

4.biogas doesn,t produces any ash or residue after burning

5.biogas is a less polluting agent as compared to cow dung cakes

6.ignition temperature(minimum temperature required by a fuel to catch fire)must be not too high or too low. this condition is fulfilled by biogas as cow dung cakes have a high ignition temperature.