allery**Reynolds number** is used to distinguish:
AHeat from work
BLaminar (streamline) from turbulent flow
CDifferent liquids by density
DStatic from dynamic friction
Answer & Solution
Correct answer: B. Laminar (streamline) from turbulent flow
Reynolds number $R_n = \rho v d / \eta$ (dimensionless).
$R_n < 1000$: laminar
$1000 < R_n < 2000$: transitional
$R_n > 2000$: turbulent flow.
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