Swirling the wine in your glass helps you evaluate the wine in
three ways. First, it affects taste by aerating the wine,
accelerating the "breathing" process, similar to decanting.
Second, it releases the aroma of the wine, giving you a better
smell of the wine. Third, by observing how the wine stays on
the side of the glass, you get an initial assessment of the
viscocity or body of the wine, basically how it’s going to feel
in your mouth.
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