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Heisenberg formulated a famous principle that now bears his name:  the Heisenberg uncertainty principle.  This principle states that the determination of the position and momentum of a mobile particle always contains errors which, when multiplied, cannot be less than the quantum constant h.  These errors are negligible in ordinary life but significant in the study of subatomic particles.

Heisenberg formulated a famous principle that now bears his name:  the Heisenberg uncertainty principle.  This principle states that the determination of the position and momentum of a mobile particle always contains errors which, when multiplied, cannot be less than the quantum constant h.  These errors are negligible in ordinary life but significant in the study of subatomic particles.