Classification of Fuel
On the basis of occurrence, fuels can be classified as of two types,primary(natural fuel) and secondary(artificial fuel). Primary fuels are of three types, solid(wood,coal,peat,lignite,cow dung, etc. ), liquid(crude oil) and gaseous(natural gas). Secondary fuels are also of three types, solid(coke, charcoal,petroleum), liquid(diesel, petrol,tar, kerosene,LPG) and gaseous(water gas, blast furnace gas,coal gas,coke oven gas,CNG).
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