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Consider a fluid confined between two horizontal parallel plates and subjected to shear flow.

In the first experiment, the plates are separated by a distance of $1 \: mm$. It is found that a shear stress of $2 \: N \: m^{-2}$ has to be applied to keep the top plate moving with a velocity of $2 \: m \: s^{-1}$, while the other plate is fixed.

In the second experiment, the plates are separated by a distance of $0.25 \: mm$. It is found that a shear stress of $3 \: N \: m^{-2}$ has to be applied to keep the top plate moving with a velocity of $1 \: m \: s^{-1}$, while the other plate is fixed.

In the range of shear rates studied, the rheological character of the fluid is ___________

1. Newtonian
2. Pseudoplastic
3. Dilatant
4. Ideal and inviscid
in Others
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