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https://www.fcpcoffee.com/blog/post/marginal-gains-maximising-extraction-through-flow-amp-pressure

Maxwell ably describes how changing the pressure, and so the effective flow rate, dramatically influences his extraction potential. He succinctly breaks down how pressure and flow rate are interlinked, this is an application of Bernoulli's principle of fluid flow where pressure and velocity of flow change with the cross sectional area of the pipe.