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<a accesskey="3" href="page.php?w=Steady_state&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=systems_theory">systems theory</a>, a <a href="page.php?w=system">system</a> or a <a href="page.php?w=Process_theory">process</a> is in a <b>steady state</b> if the variables (called <a href="page.php?w=state_variable">state variable</a>s) which define the behavior of the system or the process are unchanging in time. In <a href="page.php?w=continuous_time">continuous time</a>, this means that for those properties p of the system, the <a href="page.php?w=partial_derivative">partial derivative</a> with respect to time is</p><p>
<a accesskey="3" href="page.php?w=Steady_state&amp;p=2">3.Next</a>
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