Cloudylabs cloud chamber working approx 50 min [720p]

A sealed glass container contains liquid alcohol at the top. Emanating alcohol vapors fill the whole volume of the container until they reach the bottom of the chamber maintained to a very cold temperature (-40°C). Most of the vapour condenses on the glass surface creating a mist, but a small fraction of it stays in vapour form above the cold condenser. This creates a layer of unstable sursaturated vapour which can condense at any moment. When a charged particle crosses this vapor, it can knock electrons o