| Isolated System |
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| thermodynamics | |
| physical systems | |
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Truly isolated physical systems do not exist in reality, but real systems may behave nearly this way for finite (possibly very long) times. The concept of an isolated system can serve as a useful Model approximating many real-world situations. It is an acceptable Idealization used in constructing Mathematical Model s of certain natural Phenomena ; e.g., the Sun and Planet s in our Solar System , and the Proton and Electron in a Hydrogen Atom are often treated as isolated systems. But from time to time, a hydrogen atom will Interact with Electromagnetic Radiation and go to an Excited State . Another reason no system can be truly isolated is that even in Interstellar Space , there is the 2.7 K background Blackbody radiation left over from the Big Bang . This Heat permeates every Physical Body in the Universe . In the attempt to justify the postulate of could be specified, treating the walls simply as Mirror Boundary Condition s. This inevitably lead to Loschmidt's Paradox . However, if the Stochastic behavior of the Molecule s in actual walls is considered, along with the Random izing effect of the ambient, background Thermal Radiation , Boltzmann’s assumption of Molecular Chaos can be justified. SEE ALSO
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