Heisenberg’s uncertainty principle is a key principle in quantum mechanics. Very roughly, it states that if we know everything about where a particle is located (the uncertainty of position is small), we know nothing about its momentum (the uncertainty of momentum is large), and vice versa. Versions of the uncertainty principle also exist for other quantities as well, such as energy and time. We discuss the momentum-position and energy-time uncertainty principles separately.

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Heisenbergs uncertainty principleis a key principle in quantum mechanics Very roughly it states that if we know everythingabout where a particle is located the uncertainty of position is small we know ... View the full answer