Niels Bohr — "It is wrong to think that the task of physics is to find out how nature is. Phys…"
It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about nature.
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More from Niels Bohr
"When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it."
"The history of science is full of examples of how new ideas have been met with resistance, only to be accepted later."
"If an idea does not appear bizarre, there is no hope for it."
"The scientist's most important tool is his imagination."
"How wonderful that we have met with a paradox. Now we have some hope of making progress."
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Understanding this quote
What it means
Bohr argues that physics is not about uncovering some absolute, objective reality of nature itself. Instead, it is about what humans can meaningfully describe, measure, and communicate regarding nature through experiments and language. Our theories and equations are tools for talking about observations, not direct windows into an ultimate truth. Science is bounded by what we can observe and express, not by a god's-eye view of reality.
Relevance to Niels Bohr
This reflects Bohr's core philosophical stance as founder of the Copenhagen interpretation of quantum mechanics. He insisted observation and measurement define reality at the quantum scale, famously debating Einstein who believed in an objective underlying nature. His atomic model and complementarity principle showed electrons behave according to what experiments ask, making epistemology inseparable from physics in his lifelong worldview.
The era
Bohr spoke during the quantum revolution of the 1920s-30s, when Heisenberg's uncertainty principle and wave-particle duality shattered Newtonian certainty. Physicists confronted experiments where observation altered outcomes, forcing a crisis over what science could claim to know. Against this backdrop, and amid broader modernist doubts about objectivity in philosophy and art, Bohr's statement captured a radical shift: science surrendered its claim to describe reality directly.
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