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The proof: Cumuli altitude aerosol

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Uploaded on Mar 9, 2009

Contrails only form at very high altitudes (usually ~26,000 to 30,000 feet) where the air is extremely cold (less than -42 degrees C) and the relative humidity is near to 72 percent.
Le scie di condensazione sono le scie rilasciate dagli aerei, formate dal vapore acqueo e gas di scarico immessi nellatmosfera fredda dai motori caldi degli aerei. La loro formazione è legata a specifiche condizioni atmosferiche:
- Temperatura inferiore a -40 °C
- Umidità relativa non inferiore al 70%
- Quota di almeno 8000 metri.
http://www.tankerenemy.com/2009/03/li...

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