An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13 Search : neutral
neutral
  نتار   
natâr (#)

Fr.: neutre   

Physics: Of an atom, molecule, collection of particles, having no net charge; not electrified.
Chemistry: Exhibiting neither acid nor alkaline qualities.

From → neuter + → -al.

neuter.

neutral atom
  اتم ِ نتار   
atom-e natâr

Fr.: atome neutre   

An atom in which the number of → protons equals the number of → electrons and therefore has no net → electric charge.

neutral; → atom.

neutral density filter
  پالایه‌ی ِ چگالی ِ نتار   
pâlâye-ye cagâli-ye natâr

Fr.: filtre neutre   

A filter having a flat response over the range of wavelengths of interest. Also called neutral filter or gray filter.

neutral; → density; → filter.

neutral filter
  پالایه‌ی ِ نتار   
pâlâye-ye natâr

Fr.: filtre neutre   

Same as → neutral density filter.

neutral; → filter.

neutral gas
  گاز ِ نتار   
gâz-e natâr

Fr.: gaz neutre   

A gas which is not ionized.

neutral; → gas.

neutral hydrogen
  هیدروژن ِ نتار   
hidrožen-e natâr

Fr.: hydrogène neutre   

Non-ionized → atomic hydrogen gas which constitutes an important component of the → interstellar medium, accounting for perhaps half its mass, even though its density is very low. Its radio emission → 21-centimeter line has made it possible to map the distribution of neutral hydrogen in the → spiral arms of our own Galaxy and other nearby galaxies.

neutral; → hydrogen.

neutral mode
  مد ِ نتار، ترز ِ ~   
mod-e natâr, tarz-e ~

Fr.: mode neutre   

In hydrodynamic instability theory, a wave solution the amplitude of which does not change with time; it neither grows nor decays. Also called neutral wave.

neutral; → mode.

neutral point
  نقطه‌ی ِ نتار   
noqte-ye natâr

Fr.: point neutre   

1) A point where two fields are equal in magnitude and opposite in direction so that the net force exerted on it is zero.
2) One of several points in the sky for which the → degree of polarization of diffuse sky light is zero.

neutral; → point.

neutral tail
  دم ِ نتار، دنباله‌ی ِ ~   
dom-e natâr, donbâle-ye ~

Fr.: queue neutre   

Same as → sodium tail.

neutral; → tail.

neutral wave
  موج ِ نتار   
mowj-e natâr

Fr.: onde neutre   

Same as → neutral mode.

neutral; → wave.

neutralino
  نوترالینو   
notrâlino (#)

Fr.: neutralino   

A hypothetical particle predicted by supersymmetry theories, which aim at relating bosons to fermions. Under certain assumptions, the lightest such partner particle would be stable, and if it is neutral (a "neutralino"), would make a good dark matter candidate. Reasonable neutralino masses range from 30 GeV to 10 TeV.

From → neutral + -ino diminutive suffix.

neutralization
  نتارش   
natâreš

Fr.: neutralisation   

In optics, the process of combining two lenses having equal and opposite powers to produce a result having no power.

Verbal noun of → neutralize.

neutralize
  نتاریدن   
natâridan

Fr.: neutraliser   

To make neutral; cause to undergo neutralization.
To render electrically or magnetically neutral.

Infinitive from → neutral.