In a dynamical system, bistability means the system has two stable equilibrium states. Something that is bistable can be resting in either of two states. These rest states need not be symmetric with respect to stored energy. In terms of potential energy, a bistable system has two local minima of potential energy separated by a peak (local maximum)...
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http://en.wikipedia.org/wiki/Bistability
when a system is able to exist in either of two steady states.
Found on
http://www.chemistry-dictionary.com/definition/bistability.php
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