instability point

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• instability —   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… …   Geography glossary

• Kelvin–Helmholtz instability — Numerical simulation of a temporal Kelvin–Helmholtz instability The Kelvin–Helmholtz instability, after Lord Kelvin and Hermann von Helmholtz, can occur when velocity shear is present within a continuous fluid, or when there is sufficient… …   Wikipedia

• Convective instability — For a more general discussion of the same phenomenon, see Convective available potential energy. This article incorporates public domain text created by the US government. In meteorology, convective instability or stability of an airmass refers… …   Wikipedia

• Dew point depression — The dew point depression (T Td) is the difference between the temperature and dew point temperature at a certain height in the atmosphere. The smaller the difference, the more moisture there is, and the higher the relative humidity. In the lower… …   Wikipedia

• Arc of Instability — The Arc of Instability is a proposed, interconnected chain of politically unstable nation states in the Asia Pacific region. The term came into vogue in the late 1990s, proving especially popular with Australian politicians and journalists. The… …   Wikipedia

• Negative bias temperature instability — (NBTI) is a key reliability issue in MOSFETs. It is of immediate concern in p channel MOS devices, since they almost always operate with negative gate to source voltage; however, the very same mechanism affects also nMOS transistors when biased… …   Wikipedia

• Dew point — The dew point is the temperature to which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapor to condense into liquid water. The condensed water is called dew when it forms on a solid surface. The dew… …   Wikipedia

• Melting-point depression — This article deals with melting/freezing point depression due to very small particle size. For depression due to the mixture of another compound, see freezing point depression. Melting point depression is a term referring to the phenomenon of… …   Wikipedia

• Chetayev instability theorem — The Chetayev instability theorem for dynamical systems states that if there exists for the system a function V(x) such that in any arbitrarily small neighborhood of the origin there is a region D1 in which V(x) > 0 and on whose boundaries V(x) …   Wikipedia

• conditional instability —   when the ELR is lower than the DALR but higher than the SALR then an air mass will initially be stable and may sink. However, if the rising mechanism takes the air mass to its dew point and beyond at the SALR then the air can become instable… …   Geography glossary

• Economic Affairs — ▪ 2006 Introduction In 2005 rising U.S. deficits, tight monetary policies, and higher oil prices triggered by hurricane damage in the Gulf of Mexico were moderating influences on the world economy and on U.S. stock markets, but some other… …   Universalium