Wuhan Pneumonia epidemic, conspiracy theories surged, coupled with the current summer travel season and clear skies, the chemical wake theory, which was not taken seriously by many people, is now It has also been promoted by some Internet phone database celebrities. What is a vapor trail? Vapor wakes are formed by the condensation of water vapor and fine soot particles from the combustion of jet fuel into ice crystals. In low humidity air, the crystals dissipate. In high humidity conditions, they persist, eventually forming vapor trails visible to the naked eye over large areas of the sky.
Differences in humidity provide an explanation for why some aircraft produce vapor trails and others do not. The vapor trail of an Airbus A380 over the Netherlands in 2019. (file photo) Photo Credit: Getty Images / BBC News Some planes leave a vapor trail, some don't. Met Office meteorologist McGiffin told the BBC that high humidity meant the vapor trail could last for a long time and turn into a thin layer of cirrus clouds. Cirrus clouds are short, detached, or hair-like and often appear at high altitudes. He noted that even those so-called chemicals in the clouds are
unlikely to reach the ground because they are at such a very high altitude. Followers of chemical wake theory insist that early morning chemical wakes lead to greater cloud cover later in the day - but this phenomenon can be explained by natural convection processes. The Met Office said this was due to the sun warming the ground, causing warm air to rise and condense into clouds later in the day. How did conspiracy theories start? In the 1990s, a theory began to prevail that governments or certain forces regularly spray the Earth with chemicals from passenger flights.