What is the correct answer?

4

# In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.

μ , α and θ all have units of m/s

μ , α and θ all have units of m2/s

α and θ have units of m2/s, while μ has unit of m/s

α and θ have units of m/s, while μ has unit of m2/s

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