Bubble size, now they can measure it with a microphone
If Champagne bubble size is important to you, and for some it is. Then you will be relieved to know that the bubbles hum as they are formed, telling the listener how big they are.
Each bubble vibrates before finally bouncing off the side of the glass and rising. The bigger the bubbles the lower the note, that’s according to Kyle Spratt from the Applied Research Laboratories at the University of Texas at Austin. By listening to these bubbles it is possible to measure the bubble size. Comparing a Californian Brut to Moët & Chandon Imperial Champagne showed there was a 5% reduction in bubble size in the Champagne and the Champagne bubbles were also more active.
Of course you'll need to stick a microphone into your fizz to test the theory.