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Indiscretions of a champagne bubble paparazzi

By R&D Editors | February 14, 2012

Bubbly1-250

This is a photograph of a typical flute poured with champagne and particles acting as bubble nucleation sites freely floating in the bulk of the flute (called fliers), thus creating charming bubble trains in motion in the champagne bulk. Credit: Alain Cornu, Collection CIVC

The
innermost secrets of champagne bubbles are about to be unveiled in the
Springer journal EPJ ST. This fascinating work is the brainchild of
Gérard Liger-Belair, a scientist tackling champagne bubbles from both a
physics and a chemistry perspective. Based at the University of Reims,
in the heart of the region that gave champagne its name, the author is
appropriately affiliated with the ‘effervescence team of the molecular
and atmospheric spectrometry group’ and the ‘oenology and applied
chemistry’ laboratory.

   

To
understand what appears to be a harmless phenomenon such as the fizz in
champagne, the author studied the role of the carbon dioxide (CO2)
throughout its journey from the bottle to the glass. Precisely,
Liger-Belair focused on the second fermentation stage, resulting in the
CO2 dissolution into the wine—aided by the addition of yeast and sugar
before sealing each champagne bottle—to the stage where the gas escapes
through tiny bubbles popping on the surface of the wine in the glass.

   

Armed
with a high-speed camera, the author produced a series of visually
appealing close-up snapshots of the hidden life of these bubbles at
every stage of their short existence to analyse the forces at play. He
first explained the process underlying their birth through a process
called nucleation, triggered by the tiny impurities inside the champagne
glass. He then followed their rise and attributed their extinction when
they burst on the surface of the liquid in the glass to the cohesive
forces between molecules of the liquid called surface tension.

   

Understanding
the source of fizz provides clues on how to fine tune champagne
production. For example, the bubble size can be reduced by a factor that
can be calculated by taking into account fermentation sugar levels.
However, the method remains fundamentally the same as the one developed
by the 17th century Benedictine monk Dom Pierre Pérignon.

Citation: Liger-Belair G.,The Physics behind the Fizz in Champagne and Sparkling Wines, European Physical Journal ST (EPJ ST) 201: 1, DOI 10.1140/epjst/e2012-01528-0

   

SOURCE

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