Quote:
Originally Posted by peteradams
I got online and did some research. One site explained that the problem contrails form when heat from a plane's exhaust interacts with cold upper atmosphere ice crystals. It vaporizes them, and creates long 'strips' of clouds that spread out and eventually blend together, causing the whole sky to become overcast. Makes perfect sense.
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Not quite. The water is a product of the combustion of the fuel itself. Apparently for every kg of Jet A-1 fuel burned, 3.15kg of CO2 and 1.26kg of H2O are produced as exhaust gas (equivalent to 1.26 litres of liquid water)
Edit: I'm now waiting for the inevitable question about how 3.15kg of CO2 and 1.26kg of H2O can come from just 1kg of fuel burned
