Main Question or Discussion Point
Hey guys, so for my extended essay in physics i hav came up with a topic that required me to build a wind tunel. I already have that, but then now i need to make smoke or sumthing to pass through the wind tunnel to show the wind patterns and variations. Any ideas in how to create sumthing efficient, safe, and cheap cuz as of now i'm thinking incense is the way to go. Thanks a lot.