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physical system (Noun) The portion of the physical universe chosen for analysis, with everything outside the system known as the environment. Freebase (2.00 / 2 votes) Rate this definition: Physical system. In physics, the word system has a technical meaning, namely, it is the portion of the physical universe chosen for analysis. Everything outside the system is known as the environment, which in analysis is ignored except for its effects on the system.
Subscribe for more Videos... Quantum mechanics (QM -- also known as quantum physics, or quantum theory) is a branch of physics which deals with physical phenomena at nanoscopic scales where the action is on the order of the Planck constant.It departs from classical mechanics primarily at the quantum realm of atomic and subatomic length scales.ubscribe for more Videos... Quantum mechanics (QM -- also known as quantum physics, or quantum theory) is a branch of physics which deals with physical phenomena at nanoscopic scales where the action is on the order of the Planck constant.