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Viscosity. Bonds make molecules stick together. Heat makes molecules spin like tops, which breaks bonds. Without bonds, you have a gas; without spinning, you have a solid. Liquids are a balance between bonds and spinning. As temperature increases, molecules spin faster, which makes bonds weaker i.e. fewer in number. The relationship between temperature and thickness is called viscosity.

Oil has a low freezing point because its molecular bonds, called van der Waals, are so weak they cannot completely stop spinning. It has a high boiling point, around 800F, because its molecules, called triglycerides, are large and heavy. What looks like boiling at 500F is impurities, such as free fatty acids, evaporating.

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