The original book devoted significant space to the SCA (Specialty Coffee Association) water standards. The updated edition addresses the "zero water" phenomenon—demineralized water with specific additives (Third Wave Water, Lotus Water). New research shows that the rate of ion diffusion affects extraction speed. The updated EPUB includes graphs on magnesium extraction kinetics that were not present in the first print run.
Higher water temperatures supply more kinetic energy to the molecules. This extra energy breaks the chemical bonds holding the soluble compounds to the cellulose walls of the coffee bean. The Ideal Thermal Range
Most baristas assume "off boil" (100°C) is too hot. Gagné’s updated model shows that the slurry temperature (water + coffee) drops 6-8°C immediately upon contact because the coffee grounds act as a heat sink. The updated book provides a cheat sheet: pre-heat your brewer to 70°C, not 90°C. The math inside proves why. the physics of filter coffee epub updated
The primary goal of brewing coffee is to extract soluble solids from the roasted bean. This process happens in two distinct phases: Washing Phase
Gagné analyzes the impact of water flow on the slurry, applying surprising studies on to help understand turbulence. He also introduces the concept of brewer geometry and bypass , comparing how different drippers (V60, Kalita, etc.) physically alter the extraction. The original book devoted significant space to the
Jonathan Gagné Genre: Non-fiction / Culinary Science / Physics
Sites like Kofio.co and PERC COFFEE often stock the latest print runs. The updated EPUB includes graphs on magnesium extraction
The driving force of coffee extraction is Fick’s Laws of Diffusion. The rate of mass transfer depends heavily on water temperature, concentration gradients, and boundary layers.
Analyzes how water moves through the coffee bed and how soluble compounds dissolve.
The original book became an instant hit in 2020 because it answered the "why" behind the "how." Why does a faster pour lead to astringency? Why do flat-bottom brewers (like the Kalita Wave) extract more evenly than cone-shaped brewers (like the V60)? Gagné provides the equations.
Water dissolves soluble compounds (acids, sugars, oils) from the surface of the grounds.