In physics, the **correspondence principle** states that the behavior of systems described by the theory of quantum mechanics (or by the old quantum theory) reproduces classical physics in the limit of large quantum numbers. In other words, it says that for large orbits and for large energies, quantum calculations must agree with classical calculations.

The principle was formulated by Niels Bohr in 1920, though he had previously made use of it as early as 1913 in developing his model of the atom.

The term is also used more generally, to represent the idea that a new theory should reproduce the results of older well-established theories in those domains where the old theories work.

Read more about Correspondence Principle: Quantum Mechanics, Other Scientific Theories

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**Correspondence Principle**- Examples - Relativistic Kinetic Energy

... Einstein's mass-energy equation where the velocity, is the velocity of the body relative to the observer, is the rest mass (the observed mass of the body at zero velocity relative to the observer), and is the speed of light ... When the velocity is zero, the energy expressed above is not zero, and represents the rest energy When the body is in motion relative to the observer, the total energy exceeds the rest energy by an amount that is, by definition, the kinetic energy Using the approximation for we get when speeds are much slower than that of light or which is the Newtonian expression for kinetic energy. ...

**Correspondence Principle**(sociology)

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