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
Shows that 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 source examined here…
The SCAA prep page is not the heritage espresso definition
Shows that the March 2001 SCAA Barista Preparation Standards page examined here and the “heritage” SCAA espresso definition quoted in SCA 25 Magazine Issue 3 disagree on dose-unit wording, beverage-volume ounce conversion, brew-water…
WBC’s machine pressure band is not heritage nine-to-ten
Shows that 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…
Where thirty pounds appears in the tamp record
Separates six documentary roles for finishing-tamp force in a bounded six-source record 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
Organises the 2024–2026 World Barista Championship Official Rules so that competition espresso keeps dose free and never states a mass brew ratio, while the beverage-volume definition softens from 30 mL ± 5 mL to “around 1 fl. oz. / 30…
