Conja, Jerry & Steve: I wept in envy for how fracking smart you all are, then my head exploded, but not before I laughed at the last statement. Conja sees a multi-variable equation, I see a bumper-sticker; we all have our talents :oD
Leigh On Feb 10, 2010, at 10:21 PM, Steve Haflich wrote: > Conja Summerlin <[email protected]> wrote: > > On Wed, Feb 10, 2010 at 20:52, Jerry Houston <[email protected]> > wrote: > > Not to mention the loss of heat due to evaporation of your moist breath, > the rate of which would depend on the relative humidity of the air in > the horn ... > > I would expect once the horn has been played a little I would expect the > air in most of the horn's length to have similar humidity to breath > exhaust. > > Let's not forget relative barometric pressure. > > No, let's forget relative barometric pressure. The pressure of a gas > makes no difference to the speed of sound in that gas. The > _composition_ and temperature of the gas is what makes the difference > (including slight effects of relative humidity) but the absence of > effect due to pressure is what makes it possible to play the same horn > at sea level and in elevated cities such as Denver. > > In Denver, if you were playing outdoors, the adiabatic temperature would > make the temperature about 10 degrees C colder than the temperature at > sea level, and this would make a difference. This is why most concert > halls have central heating, especially in Denver. > > At extreme altitudes (e.g. the stratosphere) the speed of sound changes > because the composition of atmosphere changes with altitude. But the > composition is relatively constant throughout altitudes where it is > possible to play. > > ========== > > In a vacuum no one can hear you clam. > _______________________________________________ > post: [email protected] > unsubscribe or set options at > https://pegasus.memphis.edu/cgi-bin/mailman/options/horn/alex0312cor4%40mac.com _______________________________________________ post: [email protected] unsubscribe or set options at https://pegasus.memphis.edu/cgi-bin/mailman/options/horn/archive%40jab.org
