definition of a solid

[Yannick]

I am looking for a macroscopical definition because a microscopic definition seems to invoke background knowledge which seems ‘unnecessary’ for its colloquial origin . Say a liquid is an incompressible fluid. Where fluid is the idea that you can drop something in it and there’s motion because it gets carried away, a gas might have that same fluid property but not the incompressibility. Solids are bodies which don’t seem to posses that incompressability (a sponge) nor that fluid property. Although this fluid part is contentious because by that logic the earth isn’t a solid since if you drop a ball on it during an earthquake it will move.

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