Question

Define fuel efficiency.

Answer 1

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.