You seem a bit confused. Jet planes are not hot (~ -50C) at contrail heights, and their engines burn hydrocarbons to produce water vapour, and CO2. Water vapour is not visible, but contrails are ice, which is visible. The presence of contrails can be predicted, given enough data, by the Mintra line on a tephigram or the Schmidt-Appleman criterion. eg. https://www.metoffice.gov.uk/binaries/content/assets/metofficegovuk/pdf/about-us/legal/foi-disclosure/contrails_disc_log_011.pdfSo, rather than spraying aerosol, the visible streams might be water vapour that was not present before the hot plane passed. In other words planes might be creating Water Vapour.
Not strictly true. Concorde reached 127°C at the nose and trailing edge. It is well known that planes have higher cost heat-reflecting paints, and the nose invariably white, which would only be advantageous if temperatures could rise significantly higher than -50°C.Jet planes are not hot (~ -50C) at contrail heights
Jet airliners operate in the subsonic to transonic region. Concordes were always somewhat rare, and especially now! Anyhow ,where do you get your hydrogen from?Not strictly true. Concorde reached 127°C at the nose and trailing edge. It is well known that planes have special paints to reflect heat, which would only be advantageous if temperatures could be significantly higher than -50C.
Heat from friction will vary across the edges of a moving plane, and vary across the wings depending on the configuration of flaps and ailerons. What is the variation in temperatures during flight?
If hydrogen were released from other gasses then atmospheric H2 and CH4 contain enough hydrogen atoms to support ~0.001% atmospheric Water Vapour, and the atmospheric norm is a lowly ~0.01% Water Vapour at -42°C. This represents 10% increase in Water Vapour at common flying altitudes and relatively small amounts of Water Vapour have great environmental significance.where do you get your hydrogen from?
... I meant typically. Ok folks, we have to bring this forum back together.I could carry on but you get the idea.