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This section discusses fuel efficiency by comparing the heat output of different fuels like cow dung, coal, and LPG. It defines calorific value, emphasizes the importance of choosing fuels based on their efficiency, and presents the calorific values of various fuels.
Fuel efficiency is critical when choosing the ideal fuel for specific applications, especially for daily activities like boiling water. Each type of fuel produces a different amount of heat energy upon combustion, which is quantified as its calorific value. This value is expressed in kilojoules per kilogram (kJ/kg).
This section invites students to consider which fuel would be preferable for boiling water: cow dung, coal, or LPG. It highlights how each of these fuels produces varying amounts of heat energy, ultimately revealing the significance of calorific value in determining the most efficient fuel for a given purpose. Several fuels are presented along with their calorific values to illustrate the differences in heat output and environmental impact.
Fuel Efficiency: The measure of heat produced by fuels.
Calorific Value: The amount of heat energy from 1 kg of a fuel.
Heat Produced: Depends on the type of fuel used.
Environmental Impact: Different fuels affect the environment differently.
Fuel to boil, heat to toil, choose the best for your soil.
Once upon a time in a kitchen, fuels were arguing about who could boil water fastest. LPG said, 'I can do it quickly!' while coal said, 'I last longer!' But the wise chef knew the truth of calorific value.
Remember 'FACES' for fuel efficiency: Fuel, Amount, Combustion, Environment, Savings.
Using LPG for cooking results in a higher heat output than coal or cow dung because of its higher calorific value.
In a comparison, while 1 kg of cow dung might only provide 6000-8000 kJ of energy, LPG can provide up to 55000 kJ.
Term: Calorific Value
Definition: The amount of heat energy produced on complete combustion of 1 kg of a fuel, expressed in kilojoules per kilogram (kJ/kg).
The amount of heat energy produced on complete combustion of 1 kg of a fuel, expressed in kilojoules per kilogram (kJ/kg).
Term: Fuel Efficiency
Definition: A measure of the amount of heat energy produced by a fuel relative to its cost or weight.
A measure of the amount of heat energy produced by a fuel relative to its cost or weight.
Term: Pollutants
Definition: Substances that cause contamination or harm to the environment and health.
Substances that cause contamination or harm to the environment and health.
Term: Combustion
Definition: A chemical process in which a substance reacts with oxygen to produce heat and light.
A chemical process in which a substance reacts with oxygen to produce heat and light.