Ars Technica: Swirling your wine is not pretentious; it’s just good physics
Swirling a glass of wine produces a rotating wave; swirling beer foam reverses rotation.
Wine aficionados are known for gently swirling their wine in the glass before tasting, and it isn't as pretentious as it seems. (Well, maybe a little.) They claim the rotation mixes in oxygen and enhances the flavor. Physics backs them up, specifically a mini-subfield dubbed "oenodynamics." The swirling action—technically called "orbital shaking"—creates a rotating gravity wave in the direction of the swirling force being applied, churning up the liquid in the process.
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CSN Editor: I do it all the time.
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