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METASTABLE FORM [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2020-01-29

English

Subject field(s)
  • Atomic Physics
  • Relativity (Physics)
Universal entry(ies)
Ps
correct, symbol
DEF

[State] consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium.

CONT

It has been known for many years that an electron and its antiparticle, the positron, may together form a metastable hydrogen-like atom, known as positronium or Ps.

French

Domaine(s)
  • Physique atomique
  • Relativité (Physique)
Entrée(s) universelle(s)
Ps
correct, symbol
DEF

[État] lié d'un électron et de son antiparticule, le positron.

CONT

Le positronium est instable et il se désintègre en moins de 200 nanosecondes pour donner en général deux photons gamma [...]

Spanish

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Record 2 2017-10-24

English

Subject field(s)
  • Cast Iron
CONT

Malleable iron is cast as white iron, the structure being a metastable carbide in a pearlitic matrix. Through an annealing heat treatment, the brittle structure as first cast is transformed into the malleable form.... Three basic types of malleable iron are recognized within the casting industry : blackheart malleable iron, whiteheart malleable iron and pearlitic malleable iron.

Key term(s)
  • black heart malleable iron
  • black heart malleable cast iron

French

Domaine(s)
  • Fonte
CONT

Les fontes malléables à cœur noir : fonte malléable américaine. Obtenue par chauffage vers 930 °C, pendant un certain temps, variable, puis refroidissement (parfois rapide) jusqu'à 730 °C.

Spanish

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Record 3 2012-05-24

English

Subject field(s)
  • Geochemistry
  • Mineralogy
DEF

Said of a phase that is stable with respect to small disturbances but that is capable of reaction with evolution of energy if sufficiently disturbed.

CONT

The euhedral pitchblende... is a metastable form of pitchblende...

CONT

At lower temperatures, diamond is indefinitely preserved in a metastable state. ... In general the more complex the structure, the greater the likelihood of metastable low-temperature modifications and hence of alternative behaviour.

French

Domaine(s)
  • Géochimie
  • Minéralogie
DEF

Se dit d'une phase minérale placée en dehors de son domaine de stabilité et susceptible de réagir dans certaines conditions.

CONT

La pechblende euédrique [...] est une forme métastable de pechblende [...]

CONT

[La cristobalite] est instable au-dessous de 1470 ºC, mais peut persister comme forme métastable, et cela est évidemment l'explication de sa rareté dans la nature.

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Mineralogía
Save record 3

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