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fluctuations of temperature

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  • TEMPÉRATURE (météorologie) — La température est, avec la pression, l’une des grandeurs qui servent à définir l’état physique de l’air. Dans toute l’épaisseur de l’atmosphère «météorologique» (90 km environ), la composition de l’air peut en effet être estimée constante. La… …   Encyclopédie Universelle

  • Temperature record — For extreme records instead of records as a set of data, see Temperature extremes For instrument derived temperature records, see Instrumental temperature record …   Wikipedia

  • Temperature record of the past 1000 years — The temperature record of the past 1,000 years describes the reconstruction of temperature for the last 1000 years on the Northern Hemisphere. A reconstruction is needed because a reliable surface temperature record exists only since about 1850.… …   Wikipedia

  • High-temperature superconductivity — Unsolved problems in physics What causes superconductivity at temperatures above 50 kelvin? High temperature superconductors (abbreviated high Tc or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K… …   Wikipedia

  • Geologic temperature record — The Geologic temperature record are changes in Earth s environment as determined from geologic evidence on multi million to billion (109) year time scales.Evidence for past temperaturesOur evidence for past temperatures comes mainly from isotopic …   Wikipedia

  • Instrumental temperature record — See also temperature record. The instrumental temperature record shows the fluctuations of the temperature of the atmosphere and the oceans as measured by temperature sensors. Currently, the longest running temperature record is the Central… …   Wikipedia

  • Glass transition temperature — The glass transition temperature, T g, is the temperature at which an amorphous solid, such as glass or a polymer, becomes brittle on cooling, or soft on heating. More specifically, it defines a pseudo second order phase transition in which a… …   Wikipedia

  • Operating temperature — An operating temperature is the temperature at which an electrical or mechanical device operates. The device will operate effectively within a specified temperature range which varies based on the device function and application context, and… …   Wikipedia

  • Early Cambrian geochemical fluctuations — The start of the Cambrian period is marked by fluctuations in a number of geochemical records, including Strontium, Sulfur and Carbon isotopic excursions. While these anomolies are difficult to interpret, a number of possibilities have been put… …   Wikipedia

  • Mean kinetic temperature — (MKT) is a simplified way of expressing the overall effect of temperature fluctuations during storage or transit of perishable goods. The MKT is widely used in the pharmaceutical industry. The mean kinetic temperature can be expressed as: Where:… …   Wikipedia

  • Noise-equivalent temperature — (NET) is a measure of the sensitivity of a detector of thermal radiation in the infrared, terahertz or microwave portions of the electromagnetic spectrum. It is the amount of incident signal temperature that would be needed to match the internal… …   Wikipedia

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