It occurred to me whilst thinking about the sound of the wind in the trees that the wind only makes a sound because it interacts with objects. I hear it because the wind passes round me and over my ears. I think that any instrument placed to detect the sound of the wind will make the sound of the wind happen. Not provable by my own hypothesis, but I think that in the high atmosphere where there is nothing to hit that there will be no sound, unless the turbulence causes mechanical vibrations that end up as sound.
