They turn into a molecular gas.
You also now have a considerable amount of elemental hydrogen and oxygen floating around, so if there was a spark you'd get small explosion.
individuals will remember their grandfather teaching it to them when they were a child. This makes burning it very emotional, it is like someone burning a photograph of your mother outside your house just after she died.
But you're not burning somone's personal book or photo. It's your own copy. If you have an emotional investment in a copy of a book I bought, you need mental help.
Fan.