Question

Why is biogas regarded as a better fuel than cow dung cakes?

Answer 1

Bigas is the better fuel than cow dung because it does not cause pollution on burning

Answer 2

Because biogas contains mainly methane and thus, has high calorific value (about 55-60 kJ/g) while cow dung cakes cause too much of pollution and have a very low calorific value (about 6-7 kJ/g).