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Q.

The materials which are burnt to produce heat energy are known as ____.


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Detailed Solution

The materials which are burnt to produce heat energy are known as fuels.
Fuel is a substance that can react with other substances or burn itself to produce various forms of energy capable of performing valuable work. Examples of energy from fuels include heat energy, nuclear energy, etc. Fuels include wood, coal, cooking gas, kerosene, diesel, and petrol. Fuels are the most important sources of energy in our daily lives. The calorific value of a fuel is used to determine its usefulness-the higher the calorific value, the better the fuel. The amount of heat produced by completely burning a unit of fuel is known as its calorific value.
 
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