Eli5 why does cling film sometimes stick perfectly to some plates/bowls but other times it does not?
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Some cling film actually has glue attached to it. As you have probably seen, glue sometimes doesn’t stick very well to things that are greasy or slippery like smooth plastic. Another way cling film works is by stretching and then folding the film over the top of a bowl. When you stretch the film, it tries to pull back. but the film is folded over at the edge of the bowl and stuck to the sides. It doesn’t have to be stuck very tightly to the sides in order to hold the stretchy part going over the top of the bowl. You may have noticed this same thing when pulling an electrical cord that gets stuck when you go around a corner. It doesn’t take much “stickiness” to keep something stuck when it changes direction.
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