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Contrails |
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| Aviation fuel consists primarily of hydrocarbons. When the fuel is burned, the carbon combines with oxygen to form carbon dioxide. The hydrogen also combines with oxygen to form water, which emerges as steam in the exhaust. Contrails are condensation trails ( vapour trails), cirrus clouds made by the exhaust of aircraft engines. The airplane's exhaust increases the amount of moisture in the air. This causes condensation to occur, and the contrail to form. |
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