instability


instability
i. A state of the atmosphere in which a parcel of air will continue to rise, if for any reason, it is pushed up. Any instability in the atmosphere means turbulent conditions exist. The environmental lapse rate (ELR) in this case will be higher than both dry and saturated adiabatic lapse rates. Dry adiabatic lapse rate (DALR) is the rate of decrease of temperature with height of a parcel of dry air lifted adiabatically. Its value is 3°/1000 ft. Saturated adiabatic lapse rate (SALR) is the lapse rate of a parcel of saturated air and its value is 1.5°/1000 ft.
ii. A tendency of a body to continue moving away from its original state when disturbed by an external force and to continue after that force has been withdrawn.
iii. The failure of structures, such as the buckling of plates and panels under compression, and the failure of struts under end loads.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Instability — In sta*bil i*ty, n.; pl. {Instabilities}. [L. instabilitas: cf. F. instabilit[ e].] [1913 Webster] 1. The quality or condition of being unstable; lack of stability, firmness, or steadiness; liability to give way or to fail; insecurity;… …   The Collaborative International Dictionary of English

  • instability — UK US /ˌɪnstəˈbɪləti/ noun [U or C] (plural instabilities) ► ECONOMICS, POLITICS the fact of a situation being likely to change, in a way that is worrying, or the changes that happen: political/economic instability »Investors should keep in mind… …   Financial and business terms

  • instability — [in΄stə bil′ə tē] n. 1. lack of stability; unstableness; specif., a) lack of firmness or steadiness b) lack of determination; irresolution 2. tendency to behave or react violently or erratically [the instability of a chemical compound, emotional… …   English World dictionary

  • instability — instability. См. нестабильность. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • instability — index doubt (indecision), fault (weakness), frailty, inconsistency, indecision, jeopardy, risk …   Law dictionary

  • instability — early 15c., from M.Fr. instabilite inconstancy, from L. instabilitatem (nom. instabilitas) unsteadiness, from instabilis unsteady, from in not, opposite of (see IN (Cf. in ) (1)) + stabilis (see STABLE (Cf. stable) (2)) …   Etymology dictionary

  • instability — [n] imbalance, inconstancy alternation, anxiety, capriciousness, changeability, changeableness, disequilibrium, disquiet, fickleness, fitfulness, flightiness, fluctuation, fluidity, frailty, hesitation, immaturity, impermanence, inconsistency,… …   New thesaurus

  • instability — ► NOUN (pl. instabilities) ▪ lack of stability …   English terms dictionary

  • Instability — [ Hydrodynamics simulation of the Rayleigh–Taylor instability [Shengtai Li, Hui Li Parallel AMR Code for Compressible MHD or HD Equations (Los Alamos National Laboratory) [http://math.lanl.gov/Research/Highlights/amrmhd.shtml] ] ] Instability in… …   Wikipedia

  • instability — noun ADJECTIVE ▪ increased ▪ growing, increasing ▪ inherent, internal ▪ the inherent instability of financial markets ▪ …   Collocations dictionary

  • instability — [[t]ɪ̱nstəbɪ̱lɪti[/t]] instabilities N UNCOUNT: also N in pl Instability is the quality of being unstable. ...unpopular policies, which resulted in social discontent and political instability. ...Caligula s inherent mental instability... The… …   English dictionary


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