An ideal fuel is a fuel that has certain characteristics that make it efficient and effective for use. The following are some of the characteristics of an ideal fuel:

• High Calorific Value: An ideal fuel must have a high calorific value, which means it produces a high amount of heat energy on combustion.

• Readily Combustible: An ideal fuel should be easy to ignite and burn, so that it can be used efficiently.

• Availability: An ideal fuel should be easily and widely available, and at a low cost.

• Clean Burning: An ideal fuel should undergo complete combustion, leaving less residue (harmful) on burning, and not adding particulate matter to the atmosphere.

• Handling: An ideal fuel should be easy to store and transport, to prevent loss of fuel and protect the environment.

Examples of ideal fuels include compressed natural gas, hydrogen, and ethanol. These fuels have high calorific values, are readily combustible, and produce fewer harmful emissions when burned.