What is turbulent flow? Give an example of turbulent flow.

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(N/A) Turbulent flow is a type of fluid flow characterized by chaotic, irregular, and unpredictable changes in fluid velocity and pressure. It occurs when the fluid velocity exceeds a critical value, causing the Reynolds number to be high $(Re > 4000)$.
Examples of turbulent flow include:
$(i)$ Sea currents.
$(ii)$ Smoke rising from a fire.
$(iii)$ The twinkling of stars due to turbulence in the Earth's atmosphere.
$(iv)$ The flow of water around the hull of a moving boat or around aircraft wing tips.

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