Water at $70^{circ} mathrm{F}$ is flowing in a film down outside a $4 mathrm{in}$. ID vertical tube

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Water at $70^{\circ} \mathrm{F}$ is flowing in a film down outside a $4 \mathrm{in}$. ID vertical tube at a rate of $1 \mathrm{gpm}$. What is the thickness of the film?

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