# [[Epistemic status]]
- [[Fundamental laws of physics]]
# Heisenberg uncertainty principle
The uncertainty principle, proposed by Heisenberg, states that the more precisely the position of a particle is determined, the less precisely its momentum can be known, and vice versa.
>For instance, the velocity and the position of an electron around the nucleus of an atom are both observables, but they cannot be simultaneously measured to the same accuracy. When the velocity of the electron can be measured accurately, its position cannot be. In the early days of quantum theory, this fact gained the name ‘**Heisenberg uncertainty principle**’. Later, it became known as a special case of the ‘no-cloning’ theorem for general quantum observables.
>~ [[Chiara Marletto]]
This is incompatible with the [[The multiverse|many worlds interpretation]].