why does physics work differently depending on scale?

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I was talking to someone the other day who explained to me that the laws of physics as we understand them are not necessarily ‘rules’ that things on a really tiny scale obey, and the calculations we use to talk about physics on a scale that’s relevant to humans are more like estimations of what will *most probably* happen as a result. This also means there’s no such thing as a perfect circle or a perfect sphere I think? Could someone ELI5?

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Anonymous 0 Comments

It’s not PHYSICS that works differently. It’s our MODELS that work differently at different scales, which are imperfect, and therefore break down in certain situations.

Basically, our knowledge/mathematics of physics is incomplete, so we need to use a few “cobbled together” models that are the best we have right now.

BTW, saying “cobbled together” massively undersells the amount of genius and work that’s gone into our current models. It’s just that physics is even MORE complicated than that.

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