Coffee Extraction Science
Examine the thermodynamics, fluid mechanics, and solubility kinetics behind brewing. Master profile shaping across immersion and percolation, control fine-particle migration, and engineer custom water chemistry for targeted cup profiles.
Like Duolingo, but for Coffee Extraction Science. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
21 levels across 3 sections, about 42 minutes end to end, roughly 8 days at five minutes a day. It moves through Dialing and Shaping Flavor Fractions; Comparative Fluid Mechanics Across Methods; and The Physics, Chemistry, and Water Matrix.
Free forever · No credit card · iPhone & Android
Key ideas in Coffee Extraction Science
- Polar organic acids possess high solubility and extract immediately off bean cell surfaces during initial wetting
- Hydrophobic lipid fractions and roasted melanoidin complexes require prolonged contact time and thermal energy to diffuse out of the cellular matrix
- Early extraction effluent is overwhelmingly acidic and salty, while body and roasted depth extract in the latter stages
- Sucrose and simple carbohydrates are almost entirely degraded or caramelized during roasting via pyrolysis and Maillard reactions
- Sensory sweetness in coffee is largely an olfactory and gustatory illusion created by sweet-associated volatile aromatics (furans, aldehydes) modulating organic acid balance
- Viscosity and mouthfeel are predominantly driven by suspended insoluble micro-fines and lipid colloids, which are not measured by refractive TDS
- Paper filter porosity, agitation-induced migration of fines, and oil retention alter tactile body independently of soluble yield
- Chlorogenic acid lactones and quinic acid fractions diffuse heavily in late-stage extraction, causing pronounced dryness and harsh bitterness
- Terminating the yield early (tighter brew ratio) and adding pure bypass water preserves aromatics and sweetness while excluding astringent tail fractions
- Highly soluble enzymatic acids and fruity compounds dissolve rapidly in the first pours regardless of modest temperature drops
- Heavier, less soluble compounds like melanoidins and bitter phenolics require prolonged high kinetic energy to extract late in the brew
- Natural slurry temperature decay naturally suppresses astringency and bitter tails by cooling during late-stage drawdown
- High thermal-mass drippers like ceramic require minutes of pre-heating or steam bathing to reach true thermal equilibrium
- A brief rinse leaves the core ceramic cold, causing a steep boundary-layer temperature drop along the filter wall
- Local cooling along the filter wall stalls extraction of high-molecular-weight aroma volatiles at the slurry perimeter
- Initial high brew temperatures (94–96°C) efficiently dissolve bright organic acids during the bloom and early pulses
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Coffee Extraction Science the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What do coffee oils and heavy roasted melanoidins need to come out of the coffee grounds?
Get it right to open this lesson and 20 more in the app.
Where Coffee Extraction Science takes you
- 1
Dialing and Shaping Flavor Fractions
- Targeting Acid, Sugar, and Bitter Fractions
- Temperature Profiling and Thermal Drift
- 2
Comparative Fluid Mechanics Across Methods
- Percolation Versus Immersion Dynamics
- Pressure Extraction and Emulsification
- Flow Manipulation and Bypass Strategies
- 3
The Physics, Chemistry, and Water Matrix
- Particle Size Distributions and Grinder Mechanics
- Water Mineral Composition and Solute Extraction
3 sections · 7 units · 21 levels. Built to play, not to enroll.
You pick the voice
Coffee Extraction Science is taught in the Explain Like I'm 5 style: no big words. promise.. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Move past standard brew ratios and dial in coffee with physical and chemical precision. Master flow profiling, mineral buffer manipulation, and kinetic extraction to systematically unlock complex roasts.
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Move beyond the basic double shot. Master the variables of flow, pressure, and chemistry to achieve professional-grade extraction and flavor clarity.
Coffee Extraction Science
Move beyond basic brew ratios and dial in coffee with laboratory precision. Learn to manipulate grind distributions, water mineral profiles, and puck dynamics to push extraction yields without bitterness.
Start Coffee Extraction Science today.
Download Tomo, search Coffee Extraction Science, and play your first lesson in under a minute.