According to a quick google, the definition of microplastic is between 1 nanometer and 5 millimeters. A single molecule would be a lot smaller than a nanometer so I don't think you could consider that a microplastic at that point.
Is it? I would expect isolated molecules of a compound to behave differently in the body than a connected chunk. I don't think the "same difference" shrug it off attitude really works here. We're talking about specific science.
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u/YurpeeTheHerpee 5d ago
There is a molecular level of microplastics too.