Easy to understand and well-known shape of waves are these like sound spreads. Molecules of air are pushed, locally compressed, this ´pressure-wave´ runs through air, until ear registers sound.
Characteristics of longitudinal waves (resp. shockwaves) are, parts are swinging into spreading direction, i.e. parts run ahead acceleratedly, afterwards coming back to old position. Speed of spreading sound differs depending on medium.
Example Sound
At picture 02.02.01 schematically is shows a section of medium (e.g. gases or liquids) and some parts within are marked (linearly arranged, in reality molecules naturally would be in chaotic motions). At upper row, same distances represent normal spreading of molecules.
If a source of sound brings additional movements from right side, pressure front (marked by positions of parts more narrow) will move from right to left through medium (as marked by arrow upside).
Opposite, compression of medium will disperse, i.e. parts will swing back again to right side (as marked by arrow downside), until lastly starting situation exists again.
So, area of higher density (moving through space) is followed by an area of less density, until lastly differences of pressures are equalized again. At this animation, this movement´s process is visualized: one (sound-) movement from right to left is followed by second balancing movement back to right side.
Only at Level of Parts
This kind of movements demands existence of gaps between parts resp. compressible medium. At least there must exist some elasticity of material, so parts can swing that kind, e.g. by spreading of sound within solid bodies.
Ether however is gap-less and part-less substance, there can no ´ether-parts´ swing ahead and back, there are no areas of more or less density, there is no elasticity (by previous understanding) within ether substance.
So shape of longitudinal waves is impossible within ether. This kind of waves only are possible at occurrences of material world (like previous molecules of fluids or stable bodies) resp. these waves are restricted to materia of parts. Within medium of ether however, this kind of movement is not allowed.
| 02.03. No Crosswaves | Ether-Physics and -Philosophy |