A **state variable** is one of the set of variables that are used to describe the mathematical "state" of a dynamical system. Intuitively, the state of a system describes enough about the system to determine its future behaviour. Models that consist of coupled first-order differential equations are said to be in state-variable form.

Read more about State Variable: Examples, Control Systems Engineering, See Also

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“Walked forth to ease my pain

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Whose rutty bank, the which his river hems,

Was painted all with *variable* flowers,”

—Edmund Spenser (1552?–1599)

“Such is the *state* of life, that none are happy but by the anticipation of change: the change itself is nothing; when we have made it, the next wish is to change again. The world is not yet exhausted; let me see something tomorrow which I never saw before.”

—Samuel Johnson (1709–1784)