Why it matters in the cup.

Coffee glossary

Whirlpool

The spinning motion baristas create when texturing milk with the steam wand.

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Where milk changes the drink

Where milk changes the drink

What it means

The spinning motion baristas create when texturing milk with the steam wand. A controlled whirlpool keeps milk circulating so foam integrates rather than sitting in stiff layers on top. Without it, the milk tends to separate into rough bubbles and flat liquid — silky texture starts here.

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Where this leads

Each one pushes this into the cup, compares it, or helps you act on it.