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Copenhagen Interpretation
Direct answer
Copenhagen Interpretation: The Copenhagen interpretation is the family of views on quantum mechanics stemming from Niels Bohr and Werner Heisenberg, in which the theory predicts the results of measurements and not what happens between them.
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At a glance
- Also called
- bohr interpretation, wave function collapse, collapse of the wave function
- Found in
- Consciousness & Spiritual Psychology
- Related
- Complementarity, Wave Function, Observer Effect, Many-Worlds Interpretation
The Copenhagen interpretation is the family of views on quantum mechanics stemming from Niels Bohr and Werner Heisenberg, in which the theory predicts the results of measurements and not what happens between them.
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What is the Copenhagen interpretation in simple terms?
On the Copenhagen view the wave function is a tool for calculating the chances of experimental results. It is not a picture of a hidden reality. A quantum object has no definite value of a property until an arrangement of apparatus is set up to measure that property, and wave and particle descriptions are complementary, each fitted to a different arrangement. The apparatus itself must be described in everyday, classical terms.
There was never one agreed statement. Bohr avoided speaking of a collapse of the wave function, while Heisenberg and John von Neumann used the idea. None of the founders taught that human consciousness creates the result: for Bohr the decisive thing was an irreversible mark on a large instrument. That stronger claim came from others and remains a minority position.
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What sets Copenhagen Interpretation apart
Two commitments distinguish it from its rivals. One is the cut: somewhere between the atom and the laboratory bench the description changes from quantum to classical, and Bohr held that the instruments must be spoken of in ordinary language for an experiment to be reported at all. The other is restraint about what lies behind the results. Where many-worlds and pilot-wave theories say what exists between measurements, Copenhagen declines to. The label covers real disagreement, since Bohr and Heisenberg differed on collapse and on the role of the observer.
- Chief figures: Niels Bohr, Werner Heisenberg, Max Born, Wolfgang Pauli
- Formed: Copenhagen, 1925 to 1927
- Probability rule: Max Born, 1926
- Public test: the debates of Bohr and Einstein, Solvay conference, Brussels, 1927
- Name first used: by Heisenberg in the 1950s
Often mistaken for something else: The many-worlds interpretation keeps the wave function as the full reality and denies any collapse; Copenhagen treats the wave function as a calculating device and takes one result as simply occurring.
The story behind Copenhagen Interpretation
The views took shape between 1925 and 1927 at Bohr's institute in Copenhagen and were defended against Einstein at the Solvay conference of 1927. Max Born supplied the rule that links the wave function to probabilities in 1926. The name itself is later: Heisenberg used it in the 1950s when answering new rivals such as David Bohm's theory. For decades it was the account given in most textbooks.
Why Copenhagen Interpretation matters
Copenhagen Interpretation is the reading that popular writers usually mean by quantum physics, and they often credit it with claims its authors refused.
How to read Copenhagen Interpretation
Working physicists follow it as a practical rule: compute probabilities, compare with the counters, and ask no more of the formalism.
Copenhagen Interpretation in practice: an example
A reader who sees a film claim that physics says the moon is not there unless watched can ask which physicist, and find it was not Bohr.
Where readings of Copenhagen Interpretation go wrong
Copenhagen Interpretation speaks of measuring instruments, not minds, and is one interpretation among several that fit the same experiments.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- copenhagen interpretation of quantum mechanics, copenhagen interpretation meaning, bohr interpretation, wave function collapse, collapse of the wave function
- Last updated
- 2026-09-26
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Common questions
What is the Copenhagen interpretation in simple terms?
It says quantum theory gives the odds of what a measurement shows, and that asking what a particle was doing when no measurement was arranged has no answer within the theory.
Does the Copenhagen interpretation say consciousness causes collapse?
No. Bohr located the measurement in the apparatus, where an irreversible record is made. The idea that a conscious mind is needed was explored by von Neumann and Wigner and is not part of Bohr's view.
Is the Copenhagen interpretation still accepted?
It remains widely taught and used, but it no longer stands alone. Surveys of physicists show support divided among Copenhagen, many-worlds, pilot-wave and information-based readings, with no consensus.
