Jonathan Gagné
Astrophysicist and coffee researcher; author of The Physics of Filter Coffee and The Physics of Espresso, and writer of the Coffee ad Astra blog on brewing science and equipment.
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Where they publish
Coffee ad AstraBlog His blog on the physics and chemistry of coffee brewing and equipment.
Recent
- The Importance of Bed Depth 28 Nov 2025
- The Physics of Espresso is out !! 14 Aug 2025
- Recent Insights into Espresso Dynamics April 14 Chicago Conference 9 Mar 2024
Show 7 more
- What I learned from analyzing 300 particle size distributions for 24 espresso grinders 21 Sept 2023
- The Pulsar Dripper 13 Sept 2023
- The Mechanism Behind Astringency in Coffee 1 Aug 2022
- More Even Espresso Extractions 16 Jul 2022
- The Physics of Coffee Class 18 Mar 2022
- Restraining Flow to Mitigate Channels 23 Oct 2021
- Reaching Fuller Flavor Profiles with the AeroPress 8 Sept 2021
Link verified 5 Sept 2026. Recent items update automatically from the channel.
Recommends rcmnd
What they recommendrcmnd 5 things — each backed by an exact quote.
Compiled by rcmnd.app, not by them: the quotes are theirs, and each links to the post it was copied from.
Recent
Pulsar Mini Uses
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).
coffeeadastra.com 2025-11-28
their own
Lvl-10 dripper Liked
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.
coffeeadastra.com 2023-09-13
Pulsar dripper Loved
After years of development, I'm super happy to report that the dripper I dreamed of for so long is finally out!
coffeeadastra.com 2023-09-13
their own
Show 2 more
AeroPress Mixed on
While I have enjoyed the AeroPress a lot in the past especially when travelling, I have always had one big complaint about it: getting a thick coffee bed to minimize uneven flow when pressing out the water limits the brew ratios that can be used.
coffeeadastra.com 2021-09-07
James Hoffmann's AeroPress videos Recommends
I highly recommend watching all three of his videos, because the tests and discussions he presented are of a very high quality.
coffeeadastra.com 2021-09-07