How is tape sticky? What is responsible for this cohesiveness?
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There are 2 main reasons for anything being stuck to anything.
First due to positive and negative charges. On the molecular level there are differences in charges between different sides of molecule. This can be rather mild differences or more extreme but the result is positive and negative charges attracting and sticking. This is why tape is sticky.
The next is physical. This is causes by molecules getting tangled together and is essentially what Velcro is.
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