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ÅNGSTROM [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-05-16

English

Subject field(s)
  • Metrology and Units of Measure
  • Atomic Physics
  • Chemistry
Universal entry(ies)
Å
symbol
DEF

A unit of linear measurement in the centimeter-gram-second system equivalent to 10-10 metre, i.e. 1/10 000 000 000 metre.

OBS

Named in honour of Swedish physicist Anders J. Angström (1814 -1874). ... It equals 10-10 metre, 10-8 centimetre, 10-4 micron, or 10-1 millimicron. Such ultramicroscopic distances as the dimensions of atoms, molecules, unit cells and short wavelengths are expressed in angstroms.

OBS

As a unit, the initial letter of angstrom is sometimes capitalized.

OBS

The closest "equivalent" SI unit is the nanometre (1 nm = 10 Å). (SI: International System of Units).

OBS

AU; A.U.: These abbreviations could be confused with the symbols for "astronomical unit" and the chemical element "gold."

French

Domaine(s)
  • Unités de mesure et métrologie
  • Physique atomique
  • Chimie
Entrée(s) universelle(s)
Å
symbol
DEF

Unité de longueur employée en microphysique, valant un dix-millième de micron.

CONT

Des études récentes [...] ont montré que dans les verres volcaniques où les cristaux sont pourtant absents, l'altération progresse d'une façon analogue, entre des particules sphériques de quelques centaines à quelques milliers d'angströms.

OBS

Unité de longueur mesurant 10-8 cm.

OBS

Cette unité ne fait pas partie du Système international d'unités (SI). Les unités reconnues par le SI, qui peuvent être utilisées à la place de l'ångström sont le picomètre (1 Å = 100 pm) et le nanomètre (1 Å = 0,1 nm). Il semblerait que le picomètre remplace l'ångström pour mesurer les longueurs des liaisons chimiques.

Key term(s)
  • aangström

Spanish

Campo(s) temático(s)
  • Metrología y unidades de medida
  • Física atómica
  • Química
Entrada(s) universal(es)
Å
symbol
DEF

Medida de longitud que equivale a una diezmillonésima de milímetro.

CONT

El tamaño de un virus varía de 100 a 2000 angströms, por lo que únicamente se pueden observar con la ayuda de un microscopio electrónico.

OBS

Sirve para medir la longitud de onda de las radiaciones luminosas así como las dimensiones atómicas.

Save record 1

Record 2 2010-05-10

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
  • Scientific Instruments
DEF

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation.

CONT

Angstrom pyrgeometer. ... It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polished strips are shielded. The electrical power required to equalize the temperature of the four strips is taken as a measure of the solar radiation.

CONT

Regular daily observations with Angstrom pyrgeometers have been taken at the four stations with some limitations. It can only be used at night when there is no precipitation and the winds are light.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
  • Instruments scientifiques

Spanish

Save record 2

Record 3 2008-02-22

English

Subject field(s)
  • Scientific Instruments
  • Weather Stations and Meteorological Instruments and Equipment
DEF

An absolute instrument developed by Swedish physicist Knut Johan Angstrom ... for the measurement of direct solar radiation.

OBS

The radiation receiver station consists of two identical manganin strips whose temperatures are measured by attached thermocouples. One of the strips is shaded, while the other is exposed to sunlight. An electrical heating current is passed through the shaded strip so as to raise its temperature to that of the exposed strip. The electric power required to accomplish this is a measure of the solar radiation.

French

Domaine(s)
  • Instruments scientifiques
  • Stations, instruments et équipements météorologiques
DEF

Instrument mis au point par K. Angström pour effectuer la mesure du rayonnement solaire direct.

OBS

Deux lames de manganin noircies constituent le détecteur. Elles sont placées au fond d'un tube dont la longueur n'autorise qu'un angle d'ouverture de l'ordre de 5°. On expose l'une des lames au rayonnement, l'autre maintenue dans l'obscurité est parcourue par un courant électrique. On règle l'intensité du courant afin d'amener cette dernière à la température de la lame sous éclatement. Un thermocouple aux soudures collées sur les faces postérieures de ces lames contrôle l'équilibre thermique. Le rayonnement solaire direct se déduit du courant électrique nécessaire à cette compensation.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Estaciones, instrumentos y equipos meteorológicos
CONT

El pirheliómetro de Angström, también llamado pirheliómetro de compensación, consta de dos laminillas de manganina ennegrecidas, una de las cuales se expone a la luz solar, en tanto que la otra, sumida en la sombra, es calentada eléctricamente hasta igualar la temperatura de la primera; la intensidad de la corriente compensadora permite calcular la energía captada en calorías por centímetro cuadrado y por minuto.

Save record 3

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