Define fuel. Give the classification of fuel based on their occurrence with two examples of each type.

Define fuel. Give the classification of fuel based on their occurrence with two examples of each type.
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1 Answer

Answer :

Fuel: A fuel can be defined as any combustible substance which during combustion gives large amount of heat energy. 

Classification of Fuel :

I) Primary or Natural Physical State

i) Solid – e.g wood ,coal

ii) Liquid- e.g Crude oil

iii)Gaseous- e.g Natural gas (marsh gas)

II) Secondary or Artificial Physical State

i) Solid – e.g coke, charcoal

ii) Liquid- e.g Petrol, kerosene, diesel oil, lubricating oil

iii)Gaseous- e.g LPG, water gas ,producer gas ,coal gas, biogas
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