In article ,
wrote:
Moving air is going to impinge on something solid; eventually.

Obviously there are plenty of daily scenarios in which air moves but
people don't hear it.

Would that depend on your hearing? Or do you work to an average with
everything? Like 100% ;-)

--
*OK, so what's the speed of dark? *

Dave Plowman London SW
To e-mail, change noise into sound.