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Why does viscosity happen?

Molecules in a liquid like to stick together. An example is the weak hydrogen bonds in water. It is these bonds that draw water up a plant as the water is used by the cells at the top the weak bonds draw additional water up from the roots (there is no pump). In oils the hydrocarbons stick to each other in the same way, as one moves so do the rest. When you add dish washing liquid to oily water you break these bonds and so break the viscosity.
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