The way the sound waves hit your eardrums and they are moved by the sound pressure. Then your brain takes over from there.
Answer:
they keep a constant flow of heat
ion:
h t t p s : / / w w w . y o u t u b e . c o m / w a t c h ? v = x a a z U g E K u V A
this is the video that explains it
A speed does not involve the element of direction.
