The long white trails that follow an airplane, streaking across the sky, can be wondered by children and adults. People consider these lingering streaks beautiful, but many are alarmed by them. People all around the world have come up with theories on these chemtrails. Although these trails may seem beautiful, they can be harmful. Jet engines spew out very hot air, and because the water vapor is one the the byproducts of the exhaust, the air is also very humid. When the jets fly, the air in the atmosphere is very cold, often about -40 degrees Fahrenheit. Where planes fly there is usually low vapor pressure, which is the pressure of vapor in contact with its liquid or solid.
The U.S. Environmental Protection Agency explains that contrails
The U.S. Environmental Protection Agency explains that contrails