Why Do Planes Fly So High?

The video explains the reasons behind the high cruising altitudes of commercial jets, highlighting the efficiency and comfort benefits. It covers the history of jet development, the design considerations for flying at high altitudes, and the trade-offs involved. The video also discusses the importance of maintaining lift and the role of oxygen in jet engine combustion, concluding with the optimal altitude for efficient air travel.

What is the average cruising altitude of a commercial jet?

• 7.5 to 11 kilometers

• 3 to 5 kilometers

• 1 to 3 kilometers

• 12 to 15 kilometers

Why do jets fly at high altitudes?

• To avoid birds

• To reduce air resistance and increase efficiency

• To get closer to the sun

• To avoid other planes

What is a benefit of flying at higher altitudes for passengers?

• More frequent flights

• Shorter flight times

• Lower ticket prices

• More comfortable flights by avoiding weather patterns

What is a challenge of maintaining lift at high altitudes?

• Increased air pressure

• Decreased air density

• More turbulence

• Higher temperatures

Why can't jets fly too high?

• They would lose communication signals

• They would run out of fuel

• They would freeze

• There is not enough oxygen for combustion