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Physicist Finds Coffee Flow Stops Above 5 Bar Pressure

6/28/2026

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Summary

Story summary

Physicist Maciej Lisicki (University of Warsaw) found coffee flow ceases to rise above ~5 bar pressure.
The team brewed from ~1 bar to 12 bar and observed linear flow up to 5 bar, matching Darcy’s law.
X-ray images revealed the puck compacted into a poroelastic mass that closed pores, so higher pressure slowed the trickle.
The findings appeared in Physics of Fluids and will be followed by glass-bead tests.

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Story summary

Physicist Maciej Lisicki (University of Warsaw) found coffee flow ceases to rise above ~5 bar pressure.
The team brewed from ~1 bar to 12 bar and observed linear flow up to 5 bar, matching Darcy’s law.
X-ray images revealed the puck compacted into a poroelastic mass that closed pores, so higher pressure slowed the trickle.
The findings appeared in Physics of Fluids and will be followed by glass-bead tests.