Steady State

A system in a steady state has numerous properties that are unchanging in time. This implies that for any property p of the system, the partial derivative with respect to time is zero:

The concept of steady state has relevance in many fields, in particular thermodynamics, economics, and engineering. Steady state is a more general situation than dynamic equilibrium. If a system is in steady state, then the recently observed behavior of the system will continue into the future. In stochastic systems, the probabilities that various states will be repeated will remain constant.

In many systems, steady state is not achieved until some time after the system is started or initiated. This initial situation is often identified as a transient state, start-up or warm-up period.

While a dynamic equilibrium occurs when two or more reversible processes occur at the same rate, and such a system can be said to be in steady state, a system that is in steady state may not necessarily be in a state of dynamic equilibrium, because some of the processes involved are not reversible.

For example: The flow of fluid through a tube or electricity through a network could be in a steady state because there is a constant flow of fluid, or electricity. Conversely, a tank being drained or filled with fluid is a system in transient state, because its volume of fluid changes with time.

Other articles related to "steady state, state":

Steady State Theory
... In cosmology, the Steady State theory is a now-obsolete theory and model developed as an alternative to the Big Bang theory of the universe's origin (the standard ... In steady state views, new matter is continuously created as the universe expands, thus adhering to perfect cosmological principle ... While the steady state model enjoyed some popularity in the first half of the 20th Century, it is now rejected by the vast majority of professional cosmologists and other scientists, as the ...
Shear Strength (soil)
... The theoretical state at which the shear stress and density remain constant while the shear strain increases may be called the critical state, steady state, or residual strength ... Two important theories of soil shear are the critical state theory and the steady state theory ... There are key differences between the critical state condition and the steady state condition and the resulting theory corresponding to each of these conditions ...
Steady State - Applications - Fiber Optics
... In fiber optics, "steady state" is a synonym for equilibrium mode distribution. ...
Steady State Theory - External Articles and References
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Step Recovery Diode - Operating The SRD - Physical Principles
... Assume that the SRD is forward biased and in steady state i.e ... Intensity of the forward anode current IA flowing in the device during its steady state ... Quantitatively, if the steady state of forward conduction lasts for a time much greater than τ, the stored charge has the following approximate expression Now suppose ...

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