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The weather review goes on to discuss how vapor trails (contrails) can form at low altitudes, even down to the ground, if it is cold and damp enough. They even give examples I’d never heard of, contrails formed by a horse, and a herd of reindeer: ... Measuring the height of contrails...
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contrailscience.com/pre-wwii-contrails/
contrailscience.com/pre-wwii-contrails/
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Why do contrails form?; At the altitude where planes cruise (around 10-13 km) the temperature is very low, between -70 ºC and -40 ºC. Generally speaking, the temperature decreases with height as you climb from the surface of the earth to this altitude, however above this height it starts warming again.
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www.mpimet.mpg.de/en/presse/faqs/welche-rolle-spielen-k...
www.mpimet.mpg.de/en/presse/faqs/welche-rolle-spielen-kondensstreifen-fuer-unser-klima.html
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[Archive] Colour footage of the B o B dogfight contrails Historic Aviation ... Not only is it a question of the surrounding atmosphere, as this a weather phenomenon the height at which contrails form varies from day to day, but also the temperature and humidity of what the engine is blowing out.
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forum.keypublishing.com/archive/index.php?t-42466.html
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The condensation trail emitted by jet aircraft exhaust are called contrails. Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. The mixing is a result of turbulence generated by the engine exhaust.
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cimss.ssec.wisc.edu/wxwise/contrail.html
cimss.ssec.wisc.edu/wxwise/contrail.html
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But the boundary between the altitude where contrails form and where they don’t can be quite sharp, and not only can this boundary be at different height at different times, but there are very often a sort of waves in the air.
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www.hans-egebo.dk/skeptic/contrails.htm
www.hans-egebo.dk/skeptic/contrails.htm
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Contrails form through the injection of water vapor into the atmosphere by exhaust fumes from a jet engine. ... Fall streaks form when snowflakes and ice crystals fall from cirrus clouds. The change in wind with height and how quickly these ice crystals actually fall determine the shapes and sizes the fall streaks attain.
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www.angelfire.com/nv/mywebpage/con2.html
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The following sections describe the mechanical specification of the ATX form factor motherboard, including physical size, mounting hole placement, connector placement, and component height constraints. 3.1 Board Size;
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www.formfactors.org/developer%5Cspecs%5Catx2_2.pdf
www.formfactors.org/developer%5Cspecs%5Catx2_2.pdf
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Posted by Fight The Height at 07:53 0 comments ... Alternatively, click on the links below to download the postcard, download a bigger picture to work on (entries can be in any form, not just postcards), or download a brief for schools or architects.
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www.fighttheheight.co.uk/
www.fighttheheight.co.uk/
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1. How do contrails form and why? A: Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. The mixing is a result of turbulence generated by the engine exhaust. ... Because temperature and density change with height, the sound of thunder is refracted...
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hydrology.princeton.edu/~luo/PhysMet/HW4_Natalie.pdf
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