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Originally Posted by Motofool
Interesting, Jim.
It seems that the paper states that the viscosity increases with temperature for pure air, water steam and any mix alike.
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Yes, but increasing the amount of gaseous water in air decreases its viscosity and density at a given temperature, and that's the interesting part to me. But the molecular weight of an H2O molecule
is lower than that of diatomic nitrogen and oxygen, so it's not mysterious.
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Would you consider viscosity of the oils used in our bikes a form of internal friction between particle layers to keep the fluid moving?
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I suppose viscosity is related to chains of molecules in liquid not wanting to slide over each other freely, so that would be considered friction. Viscosity is not something I've studied at a molecular level though, other than reading about things like molecular chain length and cross linking.