Any spacematter, whatever is inductive. Thus 2 pieces of spacematter mutually induce motives equal and opposite to one another. For this reason space matter has a tendency to attract.
However, motive itself induces motive of equal and opposite potential. Thus a collision does not transfer motive it induces motive.
Because motive induces motive of the opposite potential motive attracts and repels at the same time within a bounded form. Such a situation is defined as a dipole potential.
The consequence of a dipole potential in a bounded form is that bodies of equal relative density and volume experience no net motive. while those of differing relative density and or volume experience a net motive by induction.
The best mathematical models seem to be exponentials of the inverse distance between bodies or logarithm of the inverse distance between bodies.
That we have discovered these properties of spacematter in electra and Magnes is unfortunate for a general understanding of the attributes of spacematter.
The role of density becomes clear. Density is a measure of the inductive potential of spacematter. The relative motive of 2 fluids of different density is demonstrated by how the fluids settle in relation to each other. The denser fluid initially bonds to the lighter fluid along a boundary, but the main mass of fluids remain separate. Over time osmosis/diffusion harvests the more mobile parts of the lighter mass. those parts with higher motive, du to mutual induction. However, when the ew density of the boundary is such that it neutralised the induction of both densities either side osmosis/diffusion stops, and the two fluid have an equal induced potential of the same kind. The barrier ia where the opposing motives neutralise one another by attraction bonding.
The more dense fluid , with higher relative motive, absorbs more of the lighter fluid to axhieve this equilibrium. f there is not enoigh lighter fluid then the whole mass of the lighter fluid will be absorbed. The denser fluid is of course changed by this absorption.
In the case of a highly viscous fluid with a lighter fluid, the lighter fluid forms a surface tension that wets the viscous material, but its motive is insufficient to counteract the high contra induction. However, placing a liher fluid between two viscous fluids creates a motive in the lighter fluid that flows between the viscous boundaries.
This motive is what Galvano discovered. The previous discussion is based on Volta's ideas,
Why are metals crucial to this induction detection?
You will note that the majority of elements are classified as metals! Thus their importance is proportional to their abundance, and gases and liquids were not initially well studied.
Tis dipole induction is eerywhere and at all scales, because motive in all its trochoidal wonder is everywhere.
The transmission of strain through this induction process is as a result of oscillating stress between the bounded objects. The strain may induce resonance in other bounded forms near of far. This is a resonance of induced dipolat motive. Sympathetic vibraory physics is therefore of interest.