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The higher an aircraft goes the less dense the air is. What this means is there is less air particles surrounding the plane. This has a positive and negative effect on the aircraft.

The positive effect is there is less friction on the aircraft allowing for better fuel economy and speeds. The negative effect is that air flow is needed to create lift. If not enough air flows over the wing then not enough lift is produced to keep the aircraft at that height. They counteract this for high altitude aircraft by increasing the speed of the aircraft. It also has an effect on the engines performance. If you get high enough the air becomes so thin that there isn't enough air to support the operations of the engines. this is why there is a mixture lever on many aircraft to allow you to change the fuel/air ration depending on height/

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Q: Describe the effects of altitude on the aircraft?
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