Everything is made out of molecules, including your palm and the wall next to you. If you put your palm on the wall, it won’t stick. You can pull it off very easily. But if you try the same thing with your finger, and attempt to pull it off of your hand, you can’t do it easily, and if you managed to do it you couldn’t put it back by just placing it there. What changed, and why do some molecules stay connected while others don’t?
In: Physics
Your example has nothing to do with molecules.
But to answer your molecular question, there are 3 forces which bring molecules together, ionic force (essentially the reason we say opposites attract in science), dipolar force (similar cause, but more like magnets where one end is + and the other -, and what’s known as London Dispersion (when within a molecule there are regions of + and – and they attract to other molecules with regions of similar strength +/-. If these forces are not present between molecules they don’t “stay together”.
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