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Why the fuel used for aeroplane is not car?

The fuel used in airplanes is different from that used in cars for several reasons:

1. Jet Fuel Density: Jet fuel (the commonly used fuel in commercial aviation) has a higher energy density compared to conventional gasoline. This means it provides more energy per unit volume, making it more efficient for long-duration flights.

2. Combustion Characteristics: The fuel utilized in aircraft must meet specific combustion requirements. Jet fuel provides a consistent and stable combustion process within aircraft engines. It has a wider range of flammability limits, ensuring reliable ignition and efficient fuel burn.

3. Safety Considerations: Jet fuel is less volatile and possesses a higher flashpoint than gasoline. This reduces the risk of vaporization and spontaneous ignition, leading to enhanced safety during handling, storage, and transportation.

4. Freezing Point: The fuel used in aircraft has a lower freezing point compared to gasoline. At high altitudes, where temperatures are extremely cold, jet fuel remains in liquid form, preventing fuel line blockage or engine malfunctions due to freezing.

5. Environmental Regulations: Jet fuel is formulated to produce lower emissions and minimize environmental impact. It has lower levels of sulfur, aromatics, and impurities, resulting in cleaner exhaust and reduced air pollution.

6. Engine Performance: Jet fuel is specifically designed to be compatible with the unique requirements of aircraft gas turbine engines. It has lubricating properties to maintain engine components and provides the necessary cooling effect for certain parts of the engine.

7. Cost Efficiency: While jet fuel can be more expensive than automotive gasoline on a per-gallon basis, its higher energy density and efficiency in aircraft engines make it more cost-effective for long-distance travel.

It's worth noting that there have been advancements in the use of alternative fuels in aviation, such as biofuels and sustainable aviation fuels, to further improve environmental sustainability and reduce carbon emissions in the aviation sector.