AFRN #1 - Bubble-Mediated and Diffusive CO₂ Loss in Champagne

Status: Active Investigation
Version: 0.1
Last Updated: July 15, 2026

This is an evolving technical document. Revisions will be made as new
experiments, analysis, and discussion become available.

The 80/20 "Rule"

References in the literature frequently state that approximately 80% of CO₂ loss from Champagne occurs through molecular diffusion across the free surface, while only 20% is carried away by visible bubbles. Is this really a general rule, or does the answer depend on glass geometry, bubble dynamics, and other physical considerations? This Research Note examines that proposition in detail.

This Research Note will examine several related questions:

1. Where did the widely cited "80/20 Rule" originate?
   • What is the original source?
   • Has it been independently verified?
2. How was the 80/20 ratio measured?
   • What experimental methods were used?
   • What assumptions were made?
3. Does the ratio depend on glass geometry?
   • Flute vs. tulip vs. coupe.
   • Does changing the exposed surface area alter the result?
4. What physical mechanisms remove CO₂ from Champagne?
   • Molecular diffusion across the free surface.
   • Bubble-mediated transport.
   • Are there additional mechanisms?
5. How do the competing interfacial areas compare?
   • Bubble surface area.
   • Liquid-air free surface.
   • Total mass-transfer area contributed by each.
6. Can a simplified physical model predict the relative contributions?
   • Mass-transfer coefficients.
   • Surface areas.
   • Bubble production rate.
   • Geometry dependence.
7. How might the hypothesis be tested experimentally?
   • Direct measurements.
   • High-speed imaging.
   • CO₂ concentration measurements.
   • Controlled comparisons among glass geometries.
8. What practical implications does this have?
   • Champagne service.
   • Glass design.
   • Bubble engineering.
   • Carbonated beverages more generally.