The aircraft normally fly at above 30,000 feet where the air is always ultra cold and very thin. The thin air reduces the amount of resistance to the aircraft moving through it and the engine's large compressor is able to compact that thin air sufficiently to get optimum combustion conditions and thus form vapor trail.
A comet usually has two tails, though only one - the vapor trail - is commonly seen from earth (the other is a gas trail). It is made of vapor blown off from the comet by the solar wind - it is mostly water vapor, but contains many other molecular substances, too - ammonia, cyanide, methane, etc.
decomposition
Water vapor, carbon dioxide, oxygen, and nitrogen
If aluminium is burned in oxygen aluminium oxide is produced, not aluminium vapors.
liquid water spontaneously turns into water vapor, its gas state. at higher temperature this phase transition accelerates until the boiling point is reached, at which point steam is produced instead of water vapor.
That line of smoke is called a vapor trail. You can still see it on low flying planes, but it must be a jet plane.
A contrail or a vapor trail. See the related link for confirmation.
Snow is frozen water vapor. It is produced when water vapor in the air is turned solid by the freezing temperature.
Carbon monoxide and other left overs from combustion. However, the trail you see behind a plane flying high up is called the contrail, and it consists of water vapor that freezes behind the plane.
When particles vaporize, they collide with the walls of the container producing vapor pressure.
Water vapor.
water vapor
steam
Transpiration
the casualties in vietnam
6 moles COULD be produced
A comet usually has two tails, though only one - the vapor trail - is commonly seen from earth (the other is a gas trail). It is made of vapor blown off from the comet by the solar wind - it is mostly water vapor, but contains many other molecular substances, too - ammonia, cyanide, methane, etc.