To fully understand this, one must understand the process by which adhesion occurs (which varies depending on the adhesive), but a good way to see the effects of cohesion producing adhesion is to wet a piece of paper and stick it to glass. In this case, water molecules stick together electrostatically. Millions of "Van Der Waals" forces hold the paper to the glass. Interesting, this experiment works with oil too. Cohesion increases adhesion again. Synthetic glue will not stick to oily or greasy surfaces.

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