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Answer:
anything used to manufacture energy is called as fuel coal and petroleum
Answer:
1. According to the law of conservation of energy, it can neither be created nor be destroyed, it can only be changed from one form to another. Thus, we cannot produce energy to do certain work. Therefore we use certain substances which help us transform one form of energy to another form.
For example, when we burn paper with a matchstick, light is produced by the flame. If we analyze this closely, light energy is not created over there, it has just been produced due to the transformation of heat energy provided by the matchstick into light energy. Thus, we always need a certain substance to convert one form of energy into another for accomplishing various jobs. We call such materials as fuels. In other words, any substance which upon combustion produces a usable amount of energy is known as fuel. Example: fossil fuels, biogas, nuclear energy, etc.
Fuels can be generally classified into two factors:
On the basis of their fuels state:
Solid Fuels
Liquid Fuels
Gaseous Fuels
On the basis of their occurrence:
Natural Fuels
Artificial Fuels
2. The amount of energy produced by the complete combustion of a material or fuel. Measured in units of energy per amount of material, e.g. kJ/kg.
3. See below
It should have a high calorific value and a moderate rate of combustion.
It should not produce any harmful products on burning.
It should cause minimum air pollution.
It should be cheap and readily available.
It should be easy to store, transport and handle.
Its ignition temperature should be above the room temperature.
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