Niels Bohr — "When we speak of the electron, we are not speaking of something that really exis…"
When we speak of the electron, we are not speaking of something that really exists, but of something that we have imagined.
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More from Niels Bohr
"A physicist is just an atom's way of looking at itself."
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Details
From discussions on the nature of scientific models and reality.
Date: Mid 20th century
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Understanding this quote
What it means
Reality at the quantum level cannot be described in ordinary terms. The electron is not a tiny ball orbiting a nucleus — it is a mathematical construct we use to predict experimental outcomes. Our mental models and language shape what we call physical reality. The act of measurement itself defines what we observe, so the electron only becomes concrete when we interact with it.
Relevance to Niels Bohr
Bohr founded the Copenhagen Interpretation, arguing quantum objects have no definite properties until measured. His 1913 atomic model replaced classical orbits with quantized energy levels, forcing him to confront that atomic entities resist visualization. His famous debates with Einstein centered precisely on whether the quantum wave function describes reality or merely our knowledge of it — Bohr consistently defended the latter.
The era
The early twentieth century shattered classical physics. Planck's quanta, Einstein's photon, and Heisenberg's uncertainty principle all emerged within decades, revealing that matter behaves nothing like everyday objects. Physicists wrestled with whether science describes nature or only predicts measurements. This philosophical crisis — realism versus instrumentalism — defined the foundational debates of quantum mechanics throughout the 1920s and 1930s.
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