✈️ Contrail Lab: Schmidt-Appleman Mixing Line, Ice Supersaturation and Persistence - 2D

Mix hot humid jet exhaust into cold air on a temperature-vapour-pressure diagram, find the Schmidt-Appleman threshold, and see whether a contrail forms, fades within minutes or persists and spreads as cirrus, with fuel, efficiency, humidity, altitude and shear controls and seven in-page numerical checks.