The viscosity of water with respect to air is about
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Water has a density of about 1000 kg/m. For air, it's about 1.2 kg/m. So kinematic viscosity of water is about 900 Pa s/(1000 kg/m) which is 0.9 x 10 m/s = 0.9 mm/s. For air, it's 18 Pa s/(1.2 kg/m) = 15 x 10 m/s = 15 mm/s.
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☑ 15mm/s ..............
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