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Question

Define fuel efficiency.


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Solution

Fuel:

  • Fuel is a substance that will undergo combustion and produce energy when the substance comes in contact with oxygen at a temperature that is equal to or higher than the ignition temperature of the Fuel. Any combustible substance can act as fuel.
  • The energy produced by fuel is expressed through calorific value.

Calorific value:

  • Calorific value can be defined as the amount of heat produced as a result of the combustion of a unit volume of the substance.
  • For a fuel to be categorized as good fuel, it should have a high calorific value, in other words, the greater the calorific value larger the amount of heat produced on burning that fuel.

Fuel efficiency:

  • Fuel efficiency may be defined as the amount of energy released per unit mass of the fuel.
  • A fuel that will be suitable for automobiles should have a high calorific value, be available in abundance, and should be easy to transport without emitting any pollutants.
  • Petrol, Diesel, and Compressed natural gas(CNG) are some fuels on which automobiles run.

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