Topic
Extraction theory
Yield, solubility and flow through a packed bed, and what the published work establishes.
Scope
Extraction yield and strength, dissolution and diffusion, flow through a packed bed, published models of espresso extraction, and the conditions under which each result was obtained.
Articles (5)
Matter 2020’s SCA paraphrase is not the heritage definition or Golden Cup
Cameron et al. (Matter 2020) attribute to the Specialty Coffee Association a historical espresso definition with a ca. 20–30 g beverage-mass parenthetical and a 92–95 °C water band that do not match the SCA 25 Magazine heritage SCAA…
The SCAA prep page is not the heritage espresso definition
The March 2001 SCAA Barista Preparation Standards page and the “heritage” SCAA espresso definition quoted in SCA 25 Magazine Issue 3 disagree on dose-unit wording, beverage-volume ounce conversion, brew-water temperature band, and…
WBC’s machine pressure band is not heritage nine-to-ten
The 2024–2026 World Barista Championship Official Rules attach an 8.5–9.5 bar espresso-machine brewing / pump-pressure band as a fixed, competitor-inalterable equipment setting, while the labeled heritage SCAA definition in SCA 25 Magazine…
Where thirty pounds appears in the tamp record
A bounded six-source record separates six documentary roles for finishing-tamp force and shows where thirty pounds appears as a finishing target and a product calibration setpoint rather than as competition wording, a packing maximum, a…
WBC espresso frees the dose while the volume line softens
The 2024–2026 World Barista Championship Official Rules keep competition espresso dose free and never state a mass brew ratio, while the beverage-volume definition softens from 30 mL ± 5 mL to “around 1 fl. oz. / 30 ml,” the technical…
