Fuels are classified based on occurance and physical state as follows.
CLASSIFICATION OF FUELS
Fuels are classified based on occurance and physical state as follows.
I. Classification based on occurrence
Fuels are classified into two types.
1. Primary fuels: It occurs in nature as such. eg., coal, petroleum, natural gas.
2. Secondary fuels: It is derived from primary fuels. e.g., coke, gasoline, coal gas.
II. Classification based on their physical state
Both primary and secondary fuels may be further sub-classified into three types.
1. Solid fuels, eg., coal, coke.
2. Liquid fuels eg., gasoline, diesel.
3. Gaseous fuels eg., coal gas, natural gas
Thus, the classification is summarised as follows.

Engineering Chemistry: Unit IV: a. Fuels : Tag: Engineering Chemistry : - Classification of Fuels
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