Why it matters in the cup.
Coffee glossary
Flow Rate
The pace at which espresso leaves the basket during a shot.
Filed under
What you see in the shot
What you see in the shot
What it means
The pace at which espresso leaves the basket during a shot. A fast flow usually signals too coarse a grind or too light a dose, while a near-stall signals the opposite. Watching the flow alongside the scale gives the barista early feedback before the shot is even tasted.
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Where this leads
Each one pushes this into the cup, compares it, or helps you act on it.
What people mean when they say "extraction"
Espresso Extraction
Read the visual cue through extraction, not appearance alone.
Separate extraction from strength in your thinking. One asks how much was dissolved, the other how concentrated the drink feels.
How you read the result
Yield
Tie what you see to what actually lands in the cup.
Think of yield as the result you are aiming for and brewed weight as the way you verify you hit it.
How you read the result
Brew Time
Visual changes often show up before the timer becomes meaningful.
Use time as a guide rail alongside yield and taste, not as the whole recipe.
What people mean when they say "extraction"
Espresso Strength
A pretty shot can still feel thin or too dense.
Use the word strength carefully. It describes concentration, not quality.