let me explain.

once definition occurs, we know.

How do measurements collapse quantum wavefunctions?

In the strange realm of electrons, photons and the other fundamental particles, quantum mechanics is law. Particles don’t behave like tiny balls, but rather like waves that are spread over a large area. Each particle is described by a “wavefunction,” or probability distribution, which tells what its location, velocity, and other properties are more likely to be, but not what those properties are. The particle actually has a range of values for all the properties, until you experimentally measure one of them — its location, for example — at which point the particle’s wavefunction “collapses” and it adopts just one location. [Newborn Babies Understand Quantum Mechanics]

But how and why does measuring a particle make its wavefunction collapse, producing the concrete reality that we perceive to exist? The issue, known as the measurement problem, may seem esoteric, but our understanding of what reality is, or if it exists at all, hinges upon the answer.

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