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WHAT IS A FUEL?
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 is one which is readily available. It is cheap. It burns easily in air at a moderate rate. It produces a large amount of heat. It does not leave behind any undersirable substances.
There is probably no fuel that could be considered as an ideal fuel. We should look for a fuel which fulfils most of the requirements for a particular use. Fuels differ in their cost. Some fuels are cheaper than others.
Source: This topic is taken from NCERT TEXTBOOK
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FUEL EFFICIENCY
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. Do these three fuels produce the same amount of heat? The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). Calorific values of some fuels are given in Table 6.4.
Table 6.4: Calorific Values of different Fuels
Source: This topic is taken from NCERT TEXTBOOK
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TYPES OF FUELS
TYPES OF FUELS
Primary (natural)
Secondary (artificial)
Solid
fuels
wood, coal, peat, dung, etc.
coke, charcoal
Liquid fuels
petroleum
diesel, gasoline, kerosene, LPG, coal tar, naphtha, ethanol
Gaseous fuels
natural gas
hydrogen, propane, methane, coal gas, water gas, blast furnace gas, coke oven gas, CNG
Table 6.3: Types of Fuels
Source: This topic is taken from NCERT TEXTBOOK