Hello everyone, in the 1910's Wilson build the very first cloud chamber based on watervapour and adiabatic decompression. With this device you can see radiation from radioactive materials and cosmic rays. For a description see: http://www.phy.cam.ac.uk/camphy/cloudchamber/cloudchamber1_1.htm I was wondering how long it would take for a device like this to lose it's watervapour? Would it be a question of milliseconds, seconds, minutes or hours? Anybody who tried building this historical device? Greetings Gijs.