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friend
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Suppose you have an experiment that measures the property of an atom as a whole, maybe you can put it through a double-slit or measure its spin, whatever. Presumably that will collapse the wavefunction that you used to describe the atom in that experiment. Would this entail that in the process you collapsed the wavefunction of all the subatomic particles that made up the atom? Could you know the overall spin, for example, and not know the spin of all of the parts?