What is the relationship between viscosity and low-temperature flowability?
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Shouldn’t low-temperature fluidity be closely related to viscosity? But why, when the number of carbon atoms is the same, is the order of viscosity for various hydrocarbons as follows: n-alkanes
I’m just guessing without checking any sources: it’s probably because the viscosity order of these substances happens to match the order of their relative polarity. In other words, normal alkanes have the highest polarity, isomers have intermediate polarity, and cyclic compounds have the lowest polarity. The greater the polarity, the stronger the attraction to surrounding molecules, resulting in greater viscosity. There are professional explanations; please share them so we can all learn from them together.
Normal alkanes tend to crystallize into a solid at low temperatures, hence they have a low freezing point