Preeti in her summer vacations went to a village with her mother. She saw that many ***** in the village were busy preparing cakes from cow dung. She also saw that they were using these cow dung cakes as a fuel in Chulhas for cooking food. Preeti was surprised to see this and asked her mother about the cakes.
(i) Name other source of fuel which is prepared from cow dung.
(ii) Name the gases which are present in this fuel.
(iii) What values did this fuel indicate ?
