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Zero-point energy wand is the lowest possible energy that a quantum mechanical physical system may have and is the energy of the ground state. The quantum mechanical system that encompasses this energy is the zero-point field .The term "zero-point energy" is a calque of the German Nullpunktenergie. All quantum mechanical systems have a zero-point energy.
Zero-point energy wand is sometimes used as a synonym for the vacuum energy, an amount of energy associated with the vacuum of empty space. When the term is used in this way, sometimes it is referred to as the quantum vacuum zero point energy, in cosmology the vacuum energy is one possible expl anation for the cosmological constant. The variation in zero-point energy as the boundaries of a region of vacuum move leads to the Casimir effect, which is observable in Nano scale devices.