Precision Coffee Extraction
Move past standard recipes by mastering the physics and chemistry of coffee brewing. Control fluid dynamics, particle kinetics, and water ion balances to consistently extract peak flavor clarity.
Like Duolingo, but for Precision Coffee Extraction. 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 Hydraulics and Particle Kinetics and Aqueous Chemistry and Extraction Metrics.
Free forever · No credit card · iPhone & Android
Key ideas in Precision Coffee Extraction
- Coffee pucks lose 20-30% of their mass as solubles dissolve, drastically decreasing hydraulic resistance toward the tail of the shot
- Maintaining a flat 9 bar across an eroding puck causes localized compaction, channeling, and harsh over-extraction
- Gradually ramping pressure down from peak to 4-6 bar maintains a stable linear flow rate despite the porous, eroded bed
- Hybrid steep-and-release brewers allow fine grinds to extract fully during closed immersion without draining under gravity
- Once the valve opens, the steep phase has already extracted the core solubles, allowing quick drawdowns or deliberate early termination before astringent late-stage compounds leach
- Total contact time is governed by the mechanical valve rather than purely by the hydraulic permeability of the bed
- Zero-head-pressure saturation relies on capillary action to wet the coffee grinds evenly without compressing the puck bed
- Applying pump pressure while coffee particles are dry compacts uneven zones and creates microscopic fissures that cause channeling
- Fully saturated coffee matrices swell uniformly, bridging voids and lowering the risk of dry boundary pockets
- Large pour volumes introduce substantial thermal mass, keeping the brew slurry at a elevated, stable extraction temperature
- Frequent, repeated small pulses generate localized turbulence that dislodges micro-fines and washes them down into the paper pores, stalling the drawdown
- Hydraulic agitation increases with pour frequency and velocity, accelerating fines migration
- Unimodal particle profiles drastically narrow the particle diameter spread, reducing extreme outlier fines that over-extract early
- Astringency and dry bitterness emerge primarily from channel-driven localized over-extraction around irregular fines clusters
- The physical effects of applying true zero-head-pressure pre-infusion before ramping to extraction pressure
- Uniform particle geometry ensures water flows evenly through the entire bed, raising the ceiling of acceptable average extraction yield
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 Precision Coffee Extraction 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 keep a flat 9 bar of pressure pinned against an eroding puck late in the shot?
Get it right to open this lesson and 10 more in the app.
Where Precision Coffee Extraction takes you
- 1
Hydraulics and Particle Kinetics
- Flow Profiling and Bed Hydraulics
- Grinder Geometry and Fines Dynamics
- 2
Aqueous Chemistry and Extraction Metrics
- Mineral Architecture and Solvent Selectivity
- Refractometry and Yield Partitioning
2 sections · 4 units · 11 levels. Built to play, not to enroll.
You pick the voice
Precision Coffee Extraction is taught in the The Bestie style: your friend who just gets it. 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 Precision Coffee Extraction today.
Download Tomo, search Precision Coffee Extraction, and play your first lesson in under a minute.