On 5 Apr 2009, at 20:15, Mats Bengtsson wrote:
A flute playing friend of mine once demonstrated what happens if you
drink a bear just before you play and all of a sudden a burp
increases the proportion of carbon dioxide in the breathing air
significantly, resulting in a much lower pitch.
It could be right, and not an effect of the alcohol and poor
performance :-), by looking at the formula
http://en.wikipedia.org/wiki/Speed_of_sound#Speed_in_ideal_gases_and_in_air
using the values of gamma and molar weight of air and CO2 given at
http://en.wikipedia.org/wiki/Adiabatic_index
http://en.wikipedia.org/wiki/Carbon_dioxide
I get for pure CO2: sqrt((1.3/44.0095)/(1.4/28.9645))) = 0.7817 =
-426.3 cents, or more than 4 semitones (a mixture will not lower as
much).
But whatever in that burp may stick to the pads, producing an annoying
noise.
Hans
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