|Ask the Experts|
Q. How much grounds are left behind in the grinder after grinding? How much water is injected during frothing / steaming?
A. We get these questions, or a variation thereof, very often, so we thought we'd devise a couple of tests to try to answer them.
First, we weighed out 20 grams of whole coffee beans, ground them in several different grinders (including Mazzers, Rancilio Rocky and Baratza Vario) and then weighed the resulting grounds to see what, if any, attrition occurred.
Next, we weighed 200ml of milk (where possible -- the stand alone frothers were different volumes,) steamed it up on different machines (like the La Marzocco GS/3, Rocket Giotto, Rancilio Silvia and Saeco Talea Touch) and then weighed the pitcher afterward to determine the volume of water left behind after steaming.
If you've also wondered about these common questions, check out these videos for the full glory of our seriously mad science.