## Uncertainty Principle

In quantum mechanics, the **uncertainty principle** is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, such as position *x* and momentum *p*, can be known simultaneously. The more precisely the position of some particle is determined, the less precisely its momentum can be known, and vice versa. The original heuristic argument that such a limit should exist was given by Werner Heisenberg in 1927, after whom it is sometimes named, as the **Heisenberg principle**. A more formal inequality relating the standard deviation of position σ_{x} and the standard deviation of momentum σ_{p} was derived by Earle Hesse Kennard later that year (and independently by Hermann Weyl in 1928),

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**Uncertainty Principle**- Critical Reactions - Free Will

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**Uncertainty Principle**

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### Famous quotes containing the word principle:

“From the age of fifteen, dogma has been the fundamental *principle* of my religion: I know no other religion; I cannot enter into the idea of any other sort of religion; religion, as a mere sentiment, is to me a dream and a mockery.”

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