Moving air inside a shower can make a light curtain bow inward. Give a fluid-pressure explanation and one reason the real situation is more complex than a simple Bernoulli model.

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Faster airflow can have lower static pressure than quieter air outside, producing an inward force; turbulence, vortices, temperature-driven convection and unsteady flow complicate the model. Identify a pressure difference across the curtain as the cause of its acceleration. Relate faster flow to reduced static pressure under suitable streamline assumptions. Recognise that a bathroom flow is viscous, turbulent and unsteady, so one streamline equation is an approximation.

Why the shower curtain moves

Moving air inside a shower can make a light curtain bow inward. Give a fluid-pressure explanation and one reason the real situation is more complex than a simple Bernoulli model.

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