Metastable

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Metastable is a state in which matter experiences a local equilibrium, but will be disturbed by a small perturbation resulting in a move to a lower energy state. The metastable state is at a delicate equilibrium which will remain unless it is disturbed.

Figure 1. E vs. x showing stable and metastable states.
Figure 1. E vs. x showing stable and metastable states.

References

http://en.wikipedia.org/wiki/Metastable