I come back to my last experiment and explore whether the difference in gravimetric vs volumetric flow could be due to changing shot TDS.
Category Archives: Physics
A Comparison between Standard and Low-Fines Espresso Shots
In this post, I compare several shots pulled with the Niche to others pulled with the EG-1 and SSP ultra-low-fines burrs.
The Four Rules of Optimal Coffee Percolation
In this post, I lay down four rules for optimal percolation that follow some of my most recent understanding about percolation physics.
A Study of Espresso Puck Resistance and How Puck Preparation Affects it
In this post, I present an experiment showing that deep WDT helps improve repeatability, and I discuss how to improve espresso preinfusion.
An Espresso Profile that Adapts to your Grind Size
In this blog post, I explore the possibility of a different way to profile espresso shots with the Decent machine to help dialing in faster.
The Physics of Kettle Streams
In this post, I discuss the physics of kettle stream and how we can maximize extraction evenness by changing pour rate and height.
The Physics of Fines Migration
In this post, I explore the details of physical phenomena that can cause fines to migrate and clog coffee filters.
The Hardness of Green Coffee
In this post, I show that surface hardness might vary more than mass density across different green coffees.
What Affects Brew Time
In this post I discuss the variables that affect brew time in detail
Extraction Uniformity and Channeling
For a while now I’ve been trying to understand the details of channeling in pour over coffee, and I found it very difficult to find a convincing description of why channeling (and thus astringency) happens suddenly when we grind a bit too fine, even if the surface of the coffee bed looks flat at theContinue reading “Extraction Uniformity and Channeling”
