(uncountable) The quality of being unstable. / (physics, countable) A state that is not in equilibrium, or in which a small change has a large irreversible effect.

plural of instability

Exhibiting instability; unstable

(archaic) instability; unstableness

(physics) A plasma instability created by two sheets of charge slipping past each other, in which energy is dissipated in the form of two surface waves propagating in opposite directions, one flowing over the other.

plural of diocotron instability

An instability of an interface between two fluids of different densities which occurs when the lighter fluid is pushing the heavier fluid.

plural of Rayleigh-Taylor instability