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- adverb In an
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Although the theory is not successfully incorporated into a quantum-mechanical framework, quantum effects are expected to be unobservably small in present-day experiments.
For example, on Bas Van Fraassen's view, we shouldn't believe that unobservably small entities like atoms exist, and yet we can use the equations and models of atomic physics to predict events that happen among the things we can observe (such as tracks in a cloud chamber or clicks in a Geiger counter).