WHAT IS A FUEL? Recall that the sources of heat energy for domestic and industrial purposes are mainly wood, charcoal, petrol, kerosene etc. These substances are called fuels. A good fuel
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FUEL EFFICIENCY Suppose you were asked to boil a given quantity of water using cow dung, coal and LPG as fuel. Which fuel would you prefer? Give your reason. You may take the help of your parents.
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TYPES OF FUELS Primary (natural) Secondary (artificial) Solid fuels wood, coal, peat, dung, etc.
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