populism material that is burnt in order to get heat and light and also to generated power the process of burning is a chemical reaction are material components with oxygen from the air and the gives of energy the energy is given in the form of heat and light. there are many different type of fuel and actually anything that burns can be called a fuel but the most common rail fuel are would call natural gas are petrol fuel can also be classified as solid liquid or gas wood was one of the first fuel used to man used by men and what was the most important to 14 many century that it was a ijast to get the cat and the cheapest but during the 16th century would start to do to become a scare in Europe and and begin to replace it cal content high percentage of carbon carbon is a most important part of most fuel fuel with a high percentage of carbon burn evenly and with a hot flame hard coal or anthracite, has a higher percentage of carbon and others types of calls and so make less smoke and the most important liquid fuel comes from petroleum they include kerasena Petrol diesel and heating oil .
answer the following questions
how many material changed into energy ?
Why did men start using coal institute of wood and fuel ?
plz answer in your language?????????
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