Jonathan Gagné
Person on 3 sites
Astrophysicist and coffee researcher; author of The Physics of Filter Coffee and The Physics of Espresso, and writer of the Coffee ad Astra blog.
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2 channels on ppll (opens ppll.app)
Where public figures publish, and what they are on record saying.
Updated 2025-11-28 -
11 beliefs on korrents (opens korrents.com)
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Dripper diameter, with other brew variables held fixed, does not change extraction or taste — only batch size. (opens korrents.com)
“changing the dripper diameter, keeping all other important variables fixed, has no impact on the brew mechanics and the resulting cup, in an "idealized" scenario”
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Coffee bed depth, unlike bed width, significantly affects flavor in a way other brew variables cannot easily compensate for. (opens korrents.com)
“the depth of a coffee bed, contrary to the width of the coffee bed, is a variable that impacts the flavor of the coffee being brewed significantly, and in a way that you cannot easily compensate for by changing other…”
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A deeper coffee bed reduces astringency by trapping long molecules on particle surfaces, not by pore-size filtration. (opens korrents.com)
“the coffee bed would act on these molecules by filtering them out a bit like oxygen adsorbers keep oxygen in; it just provides a gigantic maze of free surface area for them to stick on, and hopefully the microscopic…”
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Dripper diameter, with other brew variables held fixed, does not change extraction or taste — only batch size. (opens korrents.com)
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5 recommendations on rcmnd (opens rcmnd.app)
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Pulsar Mini (opens rcmnd.app)
“In other words, I still use exactly the same recipe that I developed for the Pulsar when I brew with the mini, I just brew with a dose smaller by a factor 0.6 (e.g., 15 grams instead of 25).”
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Pulsar dripper (opens rcmnd.app)
“After years of development, I'm super happy to report that the dripper I dreamed of for so long is finally out!”
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Lvl-10 dripper (opens rcmnd.app)
“I was super excited when I saw the Lvl-10 dripper, because it was very close to what I wanted to achieve, and as I expected, it performed very well in terms of extraction quality.”
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Pulsar Mini (opens rcmnd.app)