When I was a child, I was thinking about matterials in general. As had no idea where to start, I started with the fact that some things were solid, some were liquid and some were gasses.
I not yet had made the connection between ice, water and steam, so I thought that everything that is liquid must have some water in it. I just could not figure out how much. If something would be solid, the water was gone.
A childhood belief about chemistry

others believed things like this
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- When I was a child, I used to believe that clouds were solid and that you could walk on themAnon
- I used to believe that if i splashed water on the wall during a bath, the water would turn into spiders— justin
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- ***I used to believe that water towers was a place that someone lived and they controlled the water.— C H R I S T E N
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt