What is characterized by turbulent flow?

Turbulent flow is characterized by a chaotic and irregular movement of fluid particles. This type of flow occurs when the velocity of the fluid is high, or the viscosity is low, leading to eddies, vortices, and apparent randomness within the flow. Turbulent flow often results in increased drag on objects moving through the fluid and can enhance mixing and heat transfer.

In contrast, smooth and orderly airflow represents laminar flow, typically featuring layers of fluid sliding past one another without disruption. Low-velocity and steady states of air also describe conditions that are more aligned with laminar flow, where the flow remains consistent and predictable. Lastly, a flow condition that enhances stability would pertain to laminar regimes, where the motion is regular and less susceptible to fluctuations. Thus, the defining nature of turbulent flow is indeed one of chaos and irregularity, making the selection of the option describing its characteristics accurate.