Coffee Extraction Dynamics
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.
Like Duolingo, but for Coffee Extraction Dynamics. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through Puck Physics and Flow Control and Chemical and Thermal Kinetics.
Free forever · No credit card · iPhone & Android
Key ideas in Coffee Extraction Dynamics
- Coffee solubles dissolve and wash away as the shot progresses, causing the physical puck structure to degrade and lose hydraulic resistance.
- Maintaining fixed peak pressure against an eroding puck accelerates flow velocity through vulnerable areas, ripping micro-channels and extracting harsh, slow-dissolving astringent compounds.
- Declining the pressure profile maintains a stable volumetric flow rate, cushioning the depleted puck bed against late-shot channeling.
- Turbo shots rely on a coarser grind combined with lower peak brew pressure (typically 5–6 bars) and high flow rates.
- Coarser coffee grinds reduce fines migration and eliminate the severe localized clogging that causes micro-channeling.
- Despite short contact times (12–16 seconds), the absence of channeling yields a higher, more uniform extraction yield with exceptional flavor clarity and lower astringency.
- Gentle, low-flow water introduction wets the top layer without compacting fines or dislodging the tamped surface.
- Capillary action and swelling draw water evenly downward through the bed before hydrostatic pressure rises.
- Hydrated coffee grounds expand and self-heal voids, closing potential channel pathways before ramp to peak brew pressure.
- A flow-controlled machine dynamically modulates pump pressure to maintain target flow, automatically backing off pressure if resistance collapses or ramping it if resistance is high.
- Fixed-pressure profiling is blind to puck permeability: tighter packs choke and loose packs flood, yielding wildly divergent contact times and extraction yields.
- Direct flow profiling stabilizes mass transfer kinetics regardless of minor variations in dose mass, distribution, or puck compaction.
- Unimodal grind distributions minimize fines and boulders, yielding transparent cups where individual acids and delicate florals stand out cleanly
- Bimodal distributions intentionally generate micro-fines that emulsify oils and elevate perceived tactile mouthfeel at the expense of note separation
- Turbulent kettle pours dislodge micro-fines from larger boulders, suspending them in the slurry
- Eluviation pulls suspended fines downward through the coffee bed until they pack densely at the filter boundary
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 Dynamics 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 happens if you hold a constant 9-bar peak pressure across an eroding, porous puck late in the shot?
Get it right to open this lesson and 10 more in the app.
Where Coffee Extraction Dynamics takes you
- 1
Puck Physics and Flow Control
- Flow Profiling and Pressure Modulation
- Grind Distribution and Fines Migration
- 2
Chemical and Thermal Kinetics
- Water Chemistry and Buffer Tuning
- Thermal Stepping and Extraction Kinetics
2 sections · 4 units · 11 levels. Built to play, not to enroll.
You pick the voice
Coffee Extraction Dynamics 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.
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Start Coffee Extraction Dynamics today.
Download Tomo, search Coffee Extraction Dynamics, and play your first lesson in under a minute.