compression wave

The brain doesn’t know if the data come from photons or air compression waves picked up by the ears or mixtures of molecules picked up by the nose and the mouth.

Indeed a compression-wave of this kind passes through the gas-mixture, heated by the combustion to a very high temperature.

Thus a compression wave will move to the end of the spring, where it will be reflected and return.

He knew the compression wave caused by his movement would warn all living creatures.