The coffee puck does not follow linear pressure-flow relationships (Darcy's Law does not apply) because the puck is compressible; as pressure increases, the puck compresses further, increasing water resistance, which can result in no net change in extraction yield between lower and higher pressures.
causalpending
Evidence Quote
“the coffee puck does not behave according to a linear flow-pressure relation. So the Darcy's law does not apply for the coffee puck, and this we explain with the fact that the coffee puck is slightly compressible.”
Created: 8/13/2026, 9:53:38 AM
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