The volumetric flow rate depends directly on the permeability of the coffee bed, the pressure drop across the bed, and the fluid's viscosity.
: Analysis of brittle and ductile bean properties and their effect on particle size distribution. Practical Insights for Your Brew
Most coffee books focus on origins, roasting profiles, or tasting notes. Gagné, an astrophysicist by training, does something radically different. He applies the lens of fluid mechanics, thermodynamics, and particle physics to a single topic: the percolation of water through a bed of ground coffee.
Larger particles that make up the bulk of the grind. They require more time for water to diffuse deep into their cores. The Role of Fines Migrations
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The speed at which water moves through the bed determines the "contact time." Too fast, and you have under-extracted, sour coffee. Too slow, and you end up with a bitter, over-extracted mess.
The Physics of Filter Coffee is a seminal text. It shifted the industry conversation from "which recipe should I use?" to "how do I control the physical variables?" It is highly recommended for those who want to troubleshoot their brews scientifically. The EPUB format is particularly useful for the searchable index and the ability to carry this reference guide into a cafe environment.
No grinder produces perfectly uniform particles. Every grind contains a mix of:
Be wary of sketchy "free EPUB" sites. Many have uploaded the old PDF mislabeled as an EPUB. To verify you have the legitimate version: The volumetric flow rate depends directly on the
The Physics of Filter Coffee: Understanding the Science Behind the Brew
Find published within the last year on that specific topic. The Physics of Filter Coffee by Johnathan Gagne - Scott Rao
) gas. Introducing a small amount of water at the start—the bloom—causes the grounds to rapidly release this gas. If you do not bloom the coffee, the escaping gas creates an outward pressure that repels incoming water, creating dry pockets within the coffee bed where no extraction occurs.
Brewing coffee is essentially a problem of . You are trying to move flavor compounds from a solid (the coffee bean) into a liquid (water). However, because coffee is a complex organic material, this isn't a linear process. Factors like water temperature, particle size, and "channeling" can make the difference between a cup that tastes like berries and one that tastes like aspirin. Key Concepts in The Physics of Filter Coffee 1. The Geometry of the Bed They require more time for water to diffuse
: Fluid mechanics of pouring turbulence and the structural properties of different paper filters. 📥 Formats and Availability
Extraction is not a single event but a sequence of physical processes.
You are likely looking for the work of astrophysicist , specifically his book The Physics of Filter Coffee .
, which serves as a living extension of the book's concepts. He also released a spiritual successor, , in August 2025. The Core Work: The Physics of Filter Coffee