A chimney works best if air exposed to the chimney is______________?
Correct answer: D. Moving fast
- A. Stationary
- B. Moving
- C. Moving slowly
- D. Moving fast
Explanation
Fast-moving air over the chimney opening has lower pressure according to Bernoulli's principle, creating a larger pressure difference that draws smoke and hot gases upward. Stationary or slow-moving air produces less pressure reduction, so stationary air is the likely mistaken choice.
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About Bernoulli's Equation
Bernoulli’s equation applies conservation of energy to steady flow of an incompressible, non-viscous fluid along a streamline: pressure, kinetic and gravitational terms have a constant total. It explains pressure-speed changes in narrow pipes, Venturi meters and lift, and differs from continuity because it relates pressure as well as velocity and height.
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