Book Review: 'The Physics of Filter Coffee' by Jonathan Gagné
: Chapters on freshness, roast profiles, and how terroir influences the physical properties of the bean. Practical Highlights
: Controls total surface area and water contact time.
Paper filters are highly effective at trapping diterpenes (coffee oils). This gives filter coffee its signature clarity and light body compared to metal-mesh methods like the French Press, which allow oils to pass through. Summary of Brewing Variables Physical Effect Impact on Extraction Finer Grind Increases surface area; lowers permeability ( Speeds up diffusion; risks over-extraction. Higher Temp Lowers viscosity ( ); increases kinetic energy. Accelerates overall extraction rate. Agitation (Stirring) Disrupts the boundary layer around grinds. Increases surface washing and extraction. Deeper Bed ( ) Increases resistance to fluid flow. Lengthens contact time. the physics of filter coffee epub work
Coffee grinders do not produce uniform particles. They produce a bimodal or multimodal distribution consisting of two main groups:
Coffee beans are roasted biological cells. Roasting pockets carbon dioxide inside a brittle, porous polymer matrix. When you grind coffee, you break these cells open. This exposes the soluble compounds trapped inside. Surface Area vs. Diffusion Distance
Increases contact time, shifting profile to late-stage solids Book Review: 'The Physics of Filter Coffee' by
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Here is why this digital textbook is changing how we think about a morning ritual.
: The movement of solubles from high-concentration areas (inside the coffee cell structure) to low-concentration areas (the water). This gives filter coffee its signature clarity and
Extraction is a diffusion-limited process. Gagné models how temperature drops across the slurry affect the activation energy of dissolving solids. A 5°C difference can change extraction by 1.5%.
Before the continuous extraction begins, a preliminary "bloom" phase is required. Roasting coffee traps large amounts of carbon dioxide ( CO2cap C cap O sub 2