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In contrast to classical physics modern physics is a slightly looser term which may refer to just quantum physics or to 20th and 21st century physics in general and so always includes quantum theory and may include relativity
A physical system on the classical level is a physical system in which the laws of classical physics are valid There are no restrictions on the application of classical principles but practically the scale of classical physics is the level of isolated atoms and molecules on upwards including the macroscopic and astronomical realm Inside the atom and among atoms in a molecule the laws of classical physics break down and generally do not provide a correct description
Moreover the classical theory of electromagnetic radiation is somewhat limited in its ability to provide correct descriptions since quantum effects are observable in more everyday circumstances than quantum effects of matter Unlike quantum physics classical physics is generally characterized by the principle of complete determinism although the Manyworlds interpretation of quantum mechanics is in a sense deterministic
Mathematically classical physics equations are ones in which Plancks constant does not appear According to the correspondence principle and Ehrenfests theorem as a system becomes larger or more massive action  Plancks constant the classical dynamics tends to emerge with some exceptions such as superfluidity This is why we can usually ignore quantum mechanics when dealing with everyday objects instead the classical description will suffice However one of the most vigorous ongoing fields of research in physics is classicalquantum correspondence This field of research is concerned with the discovery of how the laws of quantum physics give rise to classical physics in the limit of the large scales of the classical le
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In contrast to classical physics, modern physics is a slightly looser term which may refer to just quantum physics or to 20th and 21st century physics in general and so always includes quantum theory and may include relativity.
A physical system on the classical level is a physical system in which the laws of classical physics are valid. There are no restrictions on the application of classical principles, but, practically, the scale of classical physics is the level of isolated atoms and molecules on upwards, including the macroscopic and astronomical realm. Inside the atom and among atoms in a molecule, the laws of classical physics break down and generally do not provide a correct description.
Moreover, the classical theory of electromagnetic radiation is somewhat limited in its ability to provide correct descriptions, since light is inherently a quantum phenomenon. Unlike quantum physics, classical physics is generally characterized by the principle of complete determinism.
Mathematically, classical physics equations are ones in which Planck's constant does not appear. According to the correspondence principle and Ehrenfest's theorem as a system becomes larger or more massive (action >> Planck's constant) the classical dynamics tends to emerge, with some exceptions, such as superfluidity. This is why we can usually ignore quantum mechanics when dealing with everyday objects; instead the classical description will suffice. However, one of the most vigorous on-going fields of research in physics is classical-quantum correspondence. This field of research is concerned with the discovery of how the laws of quantum physics give rise to classical physics in the limit of the large scales of the classical level.
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