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zero-point energy
subjectfact 
zero-point energyhas definition The energy of the lowest state of a quantum system. Amount of vibrational energy allowed by quantum mechanics to be associated with atomic particles at 0 K, whereas classical mechanics requires this to be zero. Also, the energy of an electron in its ground state.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:33:14.0
is a kind of energy2001-09-27 09:33:14.0
energyhas unit energy unit2001-09-27 09:33:13.0
numberhas value2001-09-27 09:32:57.0