Q. Substance used for producing heat energy are called
Solution:
? Fuels are substances used for producing heat energy. It is an important source of energy when they burn, they release large amount of energy.
? Fuels can have partial combustion or complete burning.
? Fossil fuel: Fossil fuels is an invaluable source of energy produced due to chemical changes taking place in the absence of oxygen, in plants and animals that have been buried deep in the earth’s crust for many million years.
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