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Old July 21 2012, 08:44 PM   #4578
Out Of My Vulcan Mind
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Re: Superman (casting, rumors, pix till release)

JarodRussell wrote: View Post
Why does Superman leave white trails in the sky? Does he have jet engines in his boots, do they leave water vapor behind?
Someone raised that question on the SuperHeroHype forum and someone else answered with this:

Contrails ( /ˈkɒntreɪlz/; short for "condensation trails") or vapour trails are long thin artificial clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapour in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wingtip vortices or in the air over the entire wing surface. Like all clouds, contrails are made of water, in the form of a suspension of billions of liquid droplets or ice crystals.

So Superman flying through the air would cause changes in air pressure and cause contrails.
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