![Complementarity Image source: Johnson Claes Complementarity Image source: Johnson Claes](http://www.timeone.ca/wp-content/uploads/2013/03/Complementarity-e1403876741329.jpg)
Classification: theory
Chapter: The New Divide
Complementarity is a central principle of the Copenhagen interpretation of quantum mechanics whereby a particle has inconsistent properties depending upon how they are measured (such as behaving like a solid particle and like a wave). A complete description requires all of the measurements.