Contrails and chemitrails

You might wonder many times about the white long trails up in the sky. Actually, most of them are formed by the planes. In case of airplanes, they are contrails, fuel dumping or chemtrails.

 Contrails are the cold gas being propelled out of hot turbine and released backward to form trails of vapour. The temperature of gas outside cabin is about -60℃ and after passing through the turbine, it turns to +600℃ forming a trail. You can also consider a situation in winter when the contrails, the vapour, coming out from the mouth where a hot gas is coming to the cold surrounding forming trails  Another situation is when the fuel is being dumped out to lose the weight of the plane like I have mentioned in my previous post "WHY DO THE PILOTS DUMP FUEL?". Similarly the next and the most hazardous to human races, the chemtrails are the trails of chemicals in the sky for a certain cause like overcoming against solar radiation or other atmospheric conditions with an effect of causing respiratory problems.