Why Do Airplanes Use Kerosene Instead of Gasoline?

Summary

The video explains why commercial aircraft use kerosene-based jet fuel rather than gasoline. Although gasoline is described as offering more power per liter, aviation needs fuel that performs reliably across extreme temperatures, pressures, and safety conditions—not simply the most powerful option.

How crude oil becomes jet fuel

• Crude oil is heated to about 400°C and fed into a tall fractional distillation tower.
• As vapor rises and cools, different components condense at different heights:
  • Gases such as propane and butane near the top
  • Gasoline below them
  • Kerosene in the middle
  • Diesel lower down
  • Heavy residues near the bottom, including material used for asphalt
• The video says roughly 10% of a barrel of crude oil becomes kerosene.
• The kerosene is treated to remove sulfur, water, and other impurities. Additives help it resist freezing and protect fuel-system components from corrosion.
• Once it meets the required specifications, it becomes Jet A or Jet A-1.

Why gasoline is unsuitable for commercial jets

• Volatility and vapor lock: At high altitude, lower pressure can cause gasoline to evaporate in fuel lines. The resulting vapor bubbles may interrupt fuel flow, potentially causing an engine to lose power or stop.
• Fire risk: The video contrasts gasoline’s low flash point with kerosene’s higher flash point, presenting kerosene as much harder to ignite accidentally.
• Cold-weather performance: Jet fuel must continue flowing in very cold conditions. The video says aviation kerosene is formulated to remain liquid down to about −47°C, while emphasizing that gasoline’s volatility is a more immediate concern than its freezing point.

Jet fuel’s other role

The video says fuel can also help cool engine components. Before being burned, it is routed through pipes near hot parts of the engine, where it absorbs heat. The video therefore presents jet fuel as serving multiple functions: energy source, coolant, and lubricant.

Main takeaway

Kerosene is chosen because it combines low volatility, a relatively high flash point, cold-weather stability, and high energy density. The video’s central lesson is that aviation favors a fuel that is stable and dependable over one that might be more powerful but less suitable for the operating environment.

The closing remarks briefly preview a follow-up topic: how turbine blades can withstand temperatures higher than their melting point. The video does not explain that subject further.

Speakers and sources featured

• One unnamed narrator or host delivers the explanation and promotional remarks.
• Background music is heard; no other speakers or cited sources are identified.