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    Hi, so basically im just writing up some lab reports for an experiment i did on viscosity. Basically we used a viscometre where some thing spins in the fluid and changes speeds. Bit vague i know but we havent been taught about this at all and have just been left on our own so i was wondering if anyone could inform about what this is actually showing. As viscosity decreases with speed im guessing the kinetic energy is to blame for the changing structure? also how does this relates to being a Newtonian fluid. Thanks!

    A Newtonian fluid is one which can be considered to not be altered under compression. This means that any change in motion due to an outside force is linear, in the basic F=ma sense.

    Another way to see it is this - If the fluid were compressible, it would be different because an applied force might just compress the fluid instead of moving it anywhere.

    If the viscosity changed with flow speed, it was a non-Newtonian fluid. It means the liquid is 'malleable' in some way, or that the molecules align such that flow is more easily achieved. I don't know if it's just about the kinetic energy though. It would be interesting to see how the viscosity changes with temperature.

    This may help: https://en.wikipedia.org/wiki/Non-Newtonian_fluid

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