What causes some planes to leave a trail across the sky?
by 
tony alonso
ANSWERS: 1
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This trail, or contrail, also known as a condensation trail, is a cirrus-like trail of condensed vapor (often resembling the tail of a kite) that is produced by jet aircraft flying at high altitudes. Contrails are produced at altitudes high enough for water droplets to freeze in a matter of seconds before they evaporate. Temperatures at such altitudes are typically below -38 degrees Celsius. [ Source: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/oth/cntrl.rxml ] Pictures of condensation trails: http://www.photovault.com/Link/Technology/Aviation_Commercial/Aircraft/Contrails.html
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