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Physical system

From Wikipedia, the free encyclopedia

Weather map as an example of a physical system
Weather map as an example of a physical system

In physics, a physical system is a portion of the physical universe chosen for analysis. Everything outside the system is known as the environment. The environment is ignored except for its effects on the system.

The split between system and environment is the analyst's choice, generally made to simplify the analysis. For example, the water in a lake, the water in half of a lake, or an individual molecule of water in the lake can each be considered a physical system. An isolated system is one that has negligible interaction with its environment. Often a system in this sense is chosen to correspond to the more usual meaning of system, such as a particular machine.

In the study of quantum coherence, the "system" may refer to the microscopic properties of an object (e.g. the mean of a pendulum bob), while the relevant "environment" may be the internal degrees of freedom, described classically by the pendulum's thermal vibrations.

YouTube Encyclopedic

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  • ✪ Introduction to Cyber-Physical Systems
  • ✪ Work, Energy, and Power: Crash Course Physics #9
  • ✪ Treating systems (the hard way) | Forces and Newton's laws of motion | Physics | Khan Academy


See also

External links

This page was last edited on 12 July 2019, at 14:19
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