Heisenberg Uncertainty Principle
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The Heisenberg Uncertainty Principle is a fundamental states that for any given quantum particle with position 
and momentum 
, then the product of the standard deviations of the measurements of and must be of the order of Planck's constant (
), which is a non-zero, positive-valued, real number.
Mathematically it is represented with this equation: 
.
In English, this means - for example - that if we measure the position of the particle perfectly then there has to be a non-zero error in our measurement of momentum (and similarly the reverse) and so we can never know the exact position and momentum of a particle at any instant.
