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.
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.
A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through Controlling Flow and Particle Physics and Tuning Chemistry and Extraction Yield.
Free forever · No credit card · iPhone & Android
Key ideas in Coffee Extraction Science
- Dense light-roast cells hydrate slowly and resist initial water penetration compared to porous dark roasts
- Extending low-pressure pre-infusion allows dense grounds to swell and consolidate evenly before full brew pressure hits
- Short pre-infusion on dense beans leads to water bypassing tight clusters via catastrophic localized channels
- Desirable volatile aromatics and fruity acids dissolve rapidly at high initial brew temperatures
- Harsh polyphenols and chlorogenic acid lactones require higher thermal energy and prolonged contact to extract late in the brew
- A declining temperature profile naturally matches the solubility kinetics of the coffee bed across the extraction timeline
- Intentional bypass truncates water-contact time through the bed, preventing late-stage extraction of bitter, astringent compounds
- It permits dialing a finer grind to maximize sweetness and TDS in the core brew volume before diluting to preferred strength
- Uncontrolled bypass down dripper walls creates uneven extraction, whereas intentional bypass adds dilution post-extraction or along separate channels
- Initial dry porous bed offers minimal initial resistance as liquid enters
- Hydration and cellular swelling rapidly maximize puck compaction and hydraulic resistance
- Ongoing mass loss through solubilization erodes puck resistance and opens pore space as water continues flowing
- Large liquid volumes retain thermal mass in the slurry far better than shallow liquid pools exposed to ambient air
- Frequent pours break surface tension and lift the bed repeatedly, inducing turbulence and migrating fines toward the filter
- High agitation increases extraction rate mechanically but drastically increases clogging risk compared to steady low-disturbance pours
- Unimodal burr geometries generate substantially fewer bimodal fines, which are normally what plug interstitial voids and create puck resistance
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.
You switch to a very dense light roast for your espresso. Why should you lengthen your low-pressure pre-infusion?
Get it right to open this lesson and 11 more in the app.
Where Coffee Extraction Science takes you
- 1
Controlling Flow and Particle Physics
- Modulating Flow and Puck Dynamics
- Managing Grind Distributions and Fines
- 2
Tuning Chemistry and Extraction Yield
- Formulating Custom Brew Water
- Refractometry and Yield Diagnostics
2 sections · 4 units · 12 levels. Built to play, not to enroll.
You pick the voice
Coffee Extraction Science is taught in the The Professor style: clear, structured, thorough. 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.
More Food & Drink on Tomo
Coffee Extraction Dynamics
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Precision Coffee Extraction and Chemistry
Explore the physical and chemical dynamics of specialty coffee brewing. Calibrate extractions using refractometry, manipulate mineral buffers in water, and decode fermentation and roast kinetics.
Precision Coffee Brewing
Move beyond the scoop and learn to control the variables that define a perfect cup. Master the math of ratios, the physics of extraction, and the chemistry of water to achieve professional consistency at home.
Dialing In Better Coffee
Move beyond following rigid recipes and learn how extraction mechanics shape every cup. Diagnose sour or bitter off-notes, tune your grind and flow, and brew coffee with intention.
Dialing In Your Coffee
Move beyond the recipe and learn to manipulate variables like a professional barista to find the 'sweet spot' in every bean.
Start Coffee Extraction Science today.
Download Tomo, search Coffee Extraction Science, and play your first lesson in under a minute.