Why does glue stick?

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Glue can work in many different ways. Basically the glue has to form some sort of interaction with the two surfaces that are being joined. The interaction can be a covalent bond, or be an intermolecular force of some sort (hydrogen bonding, permanent dipole or van der Waals forces).

There is no division between biology/chemistry/physics. It's an artificial construct designed purely for the convenience of teaching in schools and universities. Once you actually do Science there are no boundaries...no hierarchy...except Chemistry is obviously the best!
 
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