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: 22 Search : react
abstraction reaction
  واژیرش ِ آهنجش   
vâžireš-e âhanješ (#)

Fr.: réaction d'abstraction   

Chemistry: A bimolecular chemical reaction that involves removal of an atom or ion from a molecule. For example, hydrogen abstraction from methane: CH4 + Cl → CH3 + HCl.

abstraction; → reaction.

chain reaction
  واژیرش ِ زنجیری، واکنش ِ ~   
vâžireš-e zanjiri, vâkoneš-e ~

Fr.: réaction en chaîne   

A succession of → nuclear fissions when the neutrons released by previous fissions produce other nuclear fissions which themselves cause other reactions and the reactions goes on increasing exponentially.

chain; → reaction.

chemical reaction
  واژیرش ِ شیمیایی، واکنش ِ ~   
vâžireš-e šimiyâyi, vâkoneš-e ~

Fr.: réaction chimique   

A → change or → transformation in which a → substance → decomposes, → combines with other → substances, or interchanges constituents with other substances.

chemical; → reaction.

nuclear reaction
  واژیرش ِ هسته‌ای   
vâžireš-e haste-yi

Fr.: réaction nucléaire   

A process in which the energy, composition, or structure of an atomic nucleus changes.

nuclear; → reaction.

nuclear reactor
  واژیرگر ِ هسته‌ای   
vâžirgar-e haste-yi

Fr.: réacteur nucléaire   

A device in which a nuclear fission chain reaction is maintained and controlled for the production of nuclear energy or radioactive isotopes.

nuclear; → reactor.

principle of action and reaction
  پَروز ِ ژیرش و واژیرش، ~ کنش و واکنش   
parvaz-e žireš va vâžireš, ~ koneš va vâkoneš

Fr.: principe d'action et de réaction   

Newton's third law of motion, which states that for every action there must be an equal and opposite reaction.

principle; → action; → reaction.

proton-proton reaction
  واژیرش ِ پروتون-پروتون   
vâžireš-e-e proton-proton

Fr.: réaction proton-proton   

A → thermonuclear reaction in which two protons collide at very high velocities and combine to form a → deuterium. See also → proton-proton chain.

proton; → reaction.

pycnonuclear reaction
  واژیرش ِ چگال‌هسته‌ای   
vâžireš-e cagâl-hasteyi

Fr.: réaction pycnonucléaire   

A nuclear reaction that takes place at high densities and relatively low temperatures. Pycnonuclear reactions are almost temperature independent and occur even at zero temperature. These reactions are extremely slow at densities typical for normal stars but intensify with increasing density. For example, carbon burns into heavier elements at densities over 1010 g cm-3.

Pycnonuclear, from pycno- a combining form meaning "dense, thick," from Gk. pyknos "dense, solid" + → nuclear; → reaction.

Vâžireš, → reaction; cagâl-hasteyi, from cagâl, → dense, + hasteyi, → nuclear.

react
  واژیریدن   
vâžiridan

Fr.: réagir   

1) To act in response to an agent, influence, or stimulus.
2) To act in a reverse direction or manner; to act in opposition, as against some force.
3) Chem.: To undergo a → chemical reaction.

re-; → act.

reactance
  واژیرایی   
vâžirâyi

Fr.: réactance   

The opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance.

From → react + -ance a suffix of nouns.

Vâžirâyi state noun of vâžirâ agent noun of vâžiridanreact.

reactant
  واژیرا   
vâžirâ

Fr.:   

1) General: A person or thing that reacts.
2) A substance on the left side of a → chemical equation.

From → react + -ant.

reaction
  واژیرش، واکنش   
vâžireš, vâkoneš

Fr.: réaction   

1) General: Action in response to some influence, event, stimulus.
2) An equal and opposite force exerted by a body against a force acting upon it. → principle of action and reaction.
3) A → nuclear reaction; → chain reaction.
4) → chemical reaction.

Verbal noun of → react.

reaction rate
  نرخ ِ واژیرش   
nerx-e vâžireš

Fr.: taux de réaction   

The speed with which a → chemical reaction takes place. In other words, the change in → concentration of a → substance divided by the → time interval during which the change is observed.

reaction; → rate.

reactive
  واژیرنده؛ واژیرشی   
vâžirandé; vâžireši

Fr.: réactif   

Tending to react. Pertaining to or characterized by reaction.

From → react + -ive a suffix of adjectives expressing tendency, disposition, function, connection, etc.

Vâžirandé verbal adj. of vâžiridanreact; vâžireši, adj. of vâžirešreaction.

reactivity
  واژیرندگی   
vâžirandegi

Fr.: réactivité   

1) General: The quality or condition of being reactive.
2) Physics: A measure of the deviation from the condition at which a → nuclear reactor is critical.
3) Chem.: The relative → capacity of an → atom, → molecule, or → redical to undergo a → chemical reaction with another atom, molecule, or → compound.

From → reactive + → -ity.

reactor
  واژیرگر   
vâžirgar

Fr.: réacteur   

1) A device for introducing reactance into an electrical circuit (e.g. a capacitor).
2) Same as → nuclear reactor.

From → react + → -or.

reactor core
  مغزه‌ی ِ واژیرگر   
maqze-ye vâžirgar

Fr.: cœur de réacteur   

The part of a → nuclear reactor in which → nuclear fission takes place and huge quantities of heat energy are generated.

reactor; → core.

research reactor
  واژیرگر ِ پژوهشی   
vâžirgar-e pažuheši

Fr.: réacteur de recherche   

A nuclear reactor designed for radionuclide production, materials testing, and training.

research; → reactor.

resonant reaction
  واژیرش ِ باز‌آوا   
vâžireš-e bâzâvâ

Fr.: réaction résonnante   

A nuclear reaction whose probability is enhanced at an energy corresponding to an energy level of one of the nuclei. → resonance capture.

Resonant, verbal adj. of → resonate; → reaction.

subcritical reactor
  واژیرگر ِ زیر-پرژنی   
vâžirgar-e zir-paržani

Fr.: réacteur sous-critique   

A → nuclear reactor in which the rate of production of → fission neutrons is lower than the rate of production in the previous generation, and therefore the number of fissions decreases over time.

subcritical; → reactor.

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