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There is an equation, analogous to the Laplace bubble law, for a fluid flowing through a...

There is an equation, analogous to the Laplace bubble law, for a fluid flowing through a pipe: Δ?=?/?. Assuming the artery is 33% blocked, and the surface tension coefficient remains the same, by what factor should the pressure difference (between the outside and inside of the artery) change to prevent the artery from collapsing?

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I have tried to be elaborate. Comment down in case of further queries.

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