Tendency to unpredictable behavior or erratic changes of mood
she showed increasing signs of mental instability
an unstable order
unreliability attributable to being unstable
imbalance: a lack of balance or state of disequilibrium; "a hormonal imbalance"
Instability in systems is generally characterized by some of the outputs or internal states growing without bounds. Not all systems that are not stable are unstable; systems can also be marginally stable or exhibit limit cycle behavior.
In meteorology, convective instability or stability of an airmass refers to its ability to resist vertical motion. A stable atmosphere makes vertical movement difficult, and small vertical disturbances dampen out and disappear. ...
The clarification and stabilization of wine in winemaking involves removing insoluble and suspended materials that may cause a wine to become cloudy, gassy, form unwanted sediment deposit or tartaric crystals, deteriorate quicker or develop assorted wine faults due to physical, chemical or ...
The Instability is a science fiction short story by Isaac Asimov that was first published in the 1 January 1989 issue of The Observer and reprinted in the collection Gold (1995).
The quality of being unstable; A state that is not in equilibrium, or in which a small change has a large irreversible effect
abnormal or excessive motion between two or more vertebrae.
The tendency for air parcels to accelerate when they are displaced from their original position; especially, the tendency to accelerate upward after being lifted. Instability is a prerequisite for severe weather - the greater the instability, the greater the potential for severe thunderstorms. ...
The state of the atmosphere when warm and/or humid air lies beneath cooler and/or drier air, the warmer air being more buoyant and hence rising to form convective clouds and possibly thunderstorms.
the continued rising of an air mass as it is warmer than the surrounding, or environmental, air. This is especially common after the rising mass has passed the dew point and so cools at the saturated adiabatic lapse rate as the release of latent heat keeps the mass warmer. ...
The property of not being stable; thus, moving around over time, and/or uncertain in its movement over time.
The behavior of a towfish experiencing the motion of heave, pitch, roll or yaw; the erratic motion of any part of a towing assembly usually resulting from fluctuating drag forces. Towfish instability is a major factor in degrading sonar data. ...
a state of the atmosphere when a parcel of air will keep moving either up or down from its starting position when moved. An unstable atmosphere is often associated with severe weather.
A random-type variation or a lack of steadiness. Due to genetic instability, cell lines lose certain characteristics or functions in culture.
A state in which a small environmental change is sufficient to divert a system out of equilibrium, its regime of oscillation around a central position
A time dependent increase in output without a corresponding increase in the input. Many special definitions of stability have been introduced for nonlinear systems.
The state or property of a system where there is an output but no corresponding input.
A condition in the atmosphere where a layer of warm, moist air near the earth's surface is situated below a layer of cooler, drier air above it. Warm air is lighter than cool air, and its bouyancy makes it tend to rise upward in columns in a process called convection. ...
A joint whose articulatory surfaces no longer come in close contact as normal.
Conditions when spontaneous convection can occur and air parcels will accelerate upward. Associated with gusts.
Refers to a displayed number which continues to vary randomly or sporadically, rather than progressively. See "drift."
Occurs when a rising air parcel becomes less dense than the surrounding air. Since its temperature will not cool as rapidly as the surrounding environment, it will continue to rise on its own. Contrasts with stable air.
Excessive motion which is beyond normal physiologic motion. Spinal instability can be a result of traumatic disruption of the ligamentous supporting structures, degenerative disc disease, or fracture.