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: 12948 Search : far
thermal pressure
  فشار ِ گرمایی   
fešâr-e garmâyi (#)

Fr.: pression thermale   

The ordinary pressure in a gas that is due to motions of particles and can be attributed to the object's → temperature.

thermal; → pressure.

thermal pulse
  تپه‌ی ِ گرمایی، تپش ِ ~   
tape-ye garmâyi, tapeš-e ~

Fr.: pulsation thermique   

Repeated instabilities of the He burning shell which ignites in sudden burst during the final phases of the → AGB evolution.

thermal; → pulse.

thermal radiation
  تابش ِ گرمایی   
tâbeš-e garmâyi (#)

Fr.: rayonnement thermique   

The energy radiated from an object in the form of → electromagnetic waves as a result of its → temperature. Thermal radiation ranges in → wavelength from the longest → infrared radiation through the → visible light spectrum to the shortest → ultraviolet rays. In opposition, → non-thermal radiation is caused by energetic particles.

thermal; → radiation.

thermal shock
  تش ِ گرمایی، شوک ِ ~   
toš-e garmâyi, šok-e ~

Fr.: choc thermique   

Stresses induced in a material because of rapid temperature change or a → thermal gradient .

thermal; → shock.

thermal spike
  سیخک ِ گرمایی   
sixak-e garmâyi

Fr.: pointe thermale   

A → transient → rise in → temperature above the normal level in a medium.

thermal; → spike.

thermal support
  پادیر ِ گرمایی   
pâdir-e garmâyi

Fr.: support thermique   

In star formation models, the gas pressure that counters the collapsing pull of gravity.

thermal; → support.

thermalization
  یکگرمایی   
yekgarmâyi

Fr.: thermalisation   

1) The process by which a system reaches → thermal equilibrium. Thermalization results from energy exchange between the components constituting the system and their exchange with the outside medium. In a gas at a given temperature, molecules move with different velocities. The gas temperature corresponds to the mean velocity of the molecules, but individual molecules may deviate largely from the mean velocity. Some move very fast others slowly and change velocity upon collisions. Collisions reduce the energy of fast moving molecules and increase that of slow ones. In the process of thermalization → matter and → radiation are in constant interaction such that their → temperatures become identical. The process goes on until energy distribution reaches → equilibrium. The system is said to be → thermalized.
2) The condition where in an → atomic or → molecular → transition the → Boltzmann factor for the two → levels of transition takes on the value it would have in → thermodynamic equilibrium.

Verbal noun of → thermalize.

thermalize
  یکگرماییدن   
yekgarmâyidan

Fr.: thermaliser   

To bring neutrons into → thermal equilibrium with their surroundings; to produce → thermal neutrons.

From → thermal + → -ize.

Yekgarmâyidan, literally "equal warming," from yek-, → one, + garmâyidan, infinitive from garmâ, → thermo-.

thermalized line
  خط ِ یکگرماییده   
xatt-e yekgarmâyidé

Fr.: raie thermalisée   

A collisionally excited spectral line formed in high density condition well above the → critical density. At such densities the → excitation temperature is at (or very near) the → kinetic temperature of the gas. At low densities, below the critical density, the excitation temperature will be only slightly above the radiation temperature and the emission line will be practically invisible.

Thermalized, p.p. of → thermalize; → line.

thermion
  گرمایون   
garmâyon

Fr.: thermion   

An electron that has been emitted from a heated body such as the hot cathode of an electron tube.

From therm- variant of → thermo- before a vowel + → ion.

thermionic emission
  گسیل ِ گرمایونی   
gosil-e garmâyoni

Fr.: émission thermionique   

Electrons gaining enough thermal energy to escape spontaneously from the cathode or dynodes and mimic photoelectrons.

thermion; → emission.

thermo-
  گرما-   
garmâ- (#)

Fr.: thermo-   

A combining form meaning "heat, hot," used in the formation of compound words. Also therm- before a vowel.

From Gk. therme "heat," thermos "hot;" cf. L. fornax "oven, kiln," related to fornus, furnus "oven," and to formus "warm;" cognate with Pers. garm "warm," as below; P.Gmc. *warmaz (O.E. wearm; E. warm; O.H.G., Ger. warm).

Garmâ "heat, warmth," from Mid.Pers. garmâg; O.Pers./Av. garəma- "hot, warm;" cf. Skt. gharmah "heat;" cognate with Gk. therme, thermos, as above; PIE *ghworm-/*ghwerm- "warm."

thermocline
  دماشیب   
damâšib (#)

Fr.: thermocline   

A layer in a large body of water, such as a lake, in which temperature changes more rapidly with depth than it does in the layers above or below.

thermo- + → -cline.

thermocouple
  دماجفت   
damâjoft (#)

Fr.: thermocouple   

Electrical circuit consisting of two dissimilar metals, in which an electromotive force is produced when the two junctions are at different temperatures.

thermo- + → couple.

thermodynamic
  گرماتوانیک   
garmâtavânik

Fr.: thermodynamique   

Of or pertaining to → thermodynamics.

thermo-; → dynamic.

thermodynamic equilibrium
  ترازمندی ِ گرماتوانیک   
tarâzmandi-ye garmâtavânik

Fr.: équilibre thermodynamique   

The condition of a → thermodynamic system in which the available → energy is distributed uniformly among all the possible forms of energy. Furthermore, all → thermodynamic process es must be exactly balanced by their reverse processes. For example, inside a star there will be as many → ionizations of helium per second as there are → recombinations of free electrons and helium ions. Se also → local thermodynamic equilibrium (LTE).

thermodynamic; → equilibrium.

thermodynamic path
  په ِ گرماتوانیک   
pah-e garmâtavânik

Fr.: chemin thermodynamique   

The loci of various changes between two → states through which a → thermodynamic system passes during a → thermodynamic process.

thermodynamic; → path.

thermodynamic potential
  توند ِ گرماتوانیک   
tavand-e garmâtavânik

Fr.: potentiel thermodynaique   

A measure of the energy level of a → thermodynamic system. It represents the amount of → work obtainable when the system undergoes a → change. The main types of thermodynamic potential are: → internal energy, → enthalpy, the → Helmholtz free energy, and the → Gibbs free energy.

thermodynamic; → potential.

thermodynamic process
  فراروند ِ گرماتوانیک   
farâravand-e garmâtavânik

Fr.: processus thermodynamique   

An ordered set of → equilibrium states undergone by a → thermodynamic system. Thermodynamics processes have various types: → cyclic process, → reversible process, and → irreversible process, → isothermal process, → adiabatic process, → isentropic process.

thermodynamic; → process.

thermodynamic system
  راژمان ِ گرماتوانیک   
râžmân-e garmâtavânik

Fr.: système thermodynamique   

A quantity of substance or a working machine which in a well-defined way is set apart from its → environment. The boundary between the system and its surroundings can be real or an imaginary mathematical envelope. A thermodynamic system is not necessarily bound to a predefined geometry. Thermodynamic systems can be divided into three types: → open systems, → closed systems, and → isomated systems.

thermodynamic; → system.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu coa coe coh col col col com com com com com com com com com con con con con con con con con con con con coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>