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On the very small scale, i.e. quantum mechanics, a system is not in a specific state but there are different probabilities for the different states. By observing (measure) a physical property the system is forced into one of the possible states.

The problem is that not all properties are mutually measurable, when one property is observed the other one is changed (because the first observation forces the system into one specific state).

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16y ago

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Q: How can observing an experiment alter the outcome?
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