Instability 2
Instability 2 : In oceanography the reference is usually to one of the following: static instability (or hydrostatic instability) of vertical displacements of a parcel in a fluid in hydrostatic equilibrium. See: condition instability, absolute instability, convective instability, gravitational instability). Hydrodynamic instability (or dynamic instability) of parcel displacements or, more usually, of waves in a moving fluid system governed by the fundamental equations of hydrodynamics, to which the quasi- hydrostatic approximation may or may not apply. See: Helmholtz instability, inertial instability, shearing instability, baroclinic instability, barotrophic instability, rotational instability). The space scale of unstable waves is important. Hydrodynamic instability must not be confused with the phenomenon often referred to by mathematicians and physicists by the same term. A great deal of study has been devoted to the problem of the onset of turbulence in simple flows under laboratory conditions, and here viscosity is a source of instabdity
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