Eli5: Why the viscosity of oil decreases when it gets heat up?
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Oils are made of molecular chains which can vary in length depending on the oil. The viscosity increases with molecule length because for it to flow the molecules have to move past each other and overcome the attractive forces holding them together.
When you heat up the oil, the molecules have more energy which essentially means they jiggle more and therefore can overcome attractive forces and move past each other more easily. This translates to less viscosity.
Edit: typos
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