Klarinet Archive - Posting 000084.txt from 2008/01

From: "Kevin Fay" <kevin.fay.home@-----.net>
Subj: RE: [kl] warm-cool/fast-slow
Date: Sun, 06 Jan 2008 17:21:37 -0500

Keith Bowen posted:

<<<I very much doubt that adiabatic cooling is a perceptible effect at the
pressure differences involved in clarinet playing. But I am too idle to run
the calculation, so feel free to do so and convince me!

Of course, if it happens at all, it would be at the constriction formed by
the read/mouthpiece aperture, not within the mouth.>>>

Exactly my point, I think - it has everything to do with why your hand feels
cooler when you blow on it, or the "wind-chill factor," but noting to do
with clarinet playing. Making the air "warm" or "cold" is a metaphor to
teach voicing, not anything to do with the actual temperature of the air.

Indeed, if the air speed is constant, the perception of temperature will be
identical since you'd have the same adiabatic cooling if the throat were
voiced open or closed.

kjf

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