ACM 4.05 – Erosion

Please sign up for the course before starting the lesson.


In nature, we witness soil erosion, where nutrients and particulates are removed from soil and rock. In addition to diffusion, erosion is another action which contributes to coffee extraction through a process you can think of as washing the surface of the grinds.

Sponge Before

Erosion and the Soapy Sponge

Here is an analogy to help you to better understand erosion: Imagine a sponge full of suds you wish to rinse clean of soap as quickly as possible.

Back to: Advanced Coffee Making > Espresso