apeiron
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pftest said:True, from a social perspective the higher level descriptions are useful and needed. Physically, ignoring all social requirements, the lower level descriptions are most accurate. "rocks in general" do not physically exist, since any rock is always a specific physical object. The "in general" part is an abstraction that takes place in human minds.
Incorrect as all knowledge is modelling. And all modelling is reduction - the shedding of particulars to extract generals.
So we generalise the notion of local substance to produce models of things like atoms and quarks. And we also generalise the notion of form to - eventually - produce fundamental laws such as the first and second law of thermodynamics, the laws of motion, etc.
What do you think an atom is? A little hard ball. A wave function (as physically demonstrated in twin slit experiments)? A compound of more fundamental particles (which have even less concrete existence)?
A rock is always an intermediate scale object - not yet reduced towards its complementary aspects of substance and form. But you are completely missing the point if you believe science does not generalise such real life entities towards local initial condition descriptions and globally constraining laws.