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Avogadro's law qânun-e Avogâdro (#) Fr.: loi d'Avogadro A statement according to which equal volumes of different gases contain an equal number of molecules under the same conditions of temperature and pressure. After Amedeo Avogadro (1776-1856), Italian chemist and physicist, who advanced the hypothesis in 1811. |
Avogadro's number adad-e Avogâdro (#) Fr.: nombre d'Avogadro Named after Amedeo Avogadro (1776-1856), whose law allowed other physicists to calculate Avogadro's number; → constant. |
aware âgâh (#) Fr.: conscient Having knowledge; conscious; informed; alert. → awareness. M.E., variant of iwar, O.E. gewær; cf. O.S. giwar, M.Du. gheware, O.H.G. giwar, Ger. gewahr. Âgâh "aware, knowing," related to negâh "look, attention;" Mid.Pers. âkâh; Av. ākas- "to look;" Proto-Iranian *kas- "to look, appear;" cf. Skt. kāś- "to become visible, appear;" Gk. tekmar, tekmor "sign, mark;" |
awareness âgâhi (#) Fr.: conscience The state or condition of being aware; having knowledge; consciousness
(Dictionary.com). |
axial âse-yi (#) Fr.: axial Of, pertaining to, characterized by, or forming an axis. |
axial inclination darkil-e âsé Fr.: inclinaison de l'axe The angle at which a planet's axis of rotation is tilted, with respect to that of the planet's orbit. → axial; → inclination. |
axial precession pišâyân-e âse-yi Fr.: précession axiale 1) A change in the orientation of the → rotation axis
of a non-spherical, spinning body caused by → gravity.
A rotating top will precess in a direction determined by the
→ torque exerted by its → weight.
The precession
→ angular velocity is
inversely proportional to the spin angular velocity, so that the
precession is faster and more pronounced as the top slows down. → axial; → precession. |
axial symmetry hamâmuni-ye âse-yi Fr.: symmétrie axiale A symmetry with respect to a line. A geometric configuration is said to have axial symmetry if it remains unchanged when rotated about a given line. |
axial tilt gerâ-ye âsé Fr.: inclinaison de l'axe The angle between an object's → rotation axis and its → orbital axis. In other words, the angle between its → equatorial plane and → orbital plane. Same as → axial inclination and → obliquity, but not to be confounded with → orbital inclination. |
axiom bondâšt (#), arzâqâzé (#) Fr.: axiome In any system of mathematics or logic, a statement or proposition from which secondary statements or propositions are derived. The truth of an axiom is either taken for granted or assumed. In modern practice, axiom and → postulate have the same meaning. M.Fr. axiome, from L. axioma, from Gk. axioma "authority," literally "something worthy," from axioun "to think worthy," from axios "worthy," from PIE adj. *ag-ty-o- "weighty," from base *ag- "to drive, draw, move." Bondâšt, literally "taking as the base," from bon
"root, origin, base" + dâšt "held," from dâštan "to have,
to hold, to maintain, to consider." |
axiom of constraints bondâšt-e pâvandhâ Fr.: axiome des contraintes An axiom in → statics, stating that any → constrained body can be treated as a → free body detached from its → constraints, provided the latter are represented by their → reactions. → axiom; → constraint. |
axiomatic bondâšti Fr.: axiomatique Of, relating to, or resembling an → axiom. |
axiomatic system râžmân-e bondâšti Fr.: système axiomatique Any system of → logic which explicitly states → axioms from which → theorems can be → deduced. |
axion aksion (#) Fr.: axion A hypothetical weakly-interacting → boson of small mass required by models of → particle physics in order to solve the strong CP problem and explain a number of observed astrophysical/cosmological phenomena, including → dark matter, and the dimming of → type Ia → supernovae (→ accelerating Universe). Photons traveling in the → intergalactic medium would in part turn into axions in the presence of magnetic fields. The transformed photons are not detected on Earth and therefore supernovae would appear fainter even if the Universe is not accelerating. Axion, first coined by Frank Wilczek (2004 Nobel Prize in Physics) apparently after a brand of washing detergent! The reason seems to be the idea that the particle will iron out a wrinkle in the → standard model of fundamental particles and forces while solving the problem of the Universe's → missing mass. |
axis âsé (#) Fr.: axe 1) One of the principal lines through the center of a figure or a
solid, especially, the line which divides the figure or solid
symmetrically. L. axis "axle, pivot," akin to O.E. eax "axis, axle," Gk. axon "axle," Skt. aksa- "axle, axis, beam of a balance;" PIE base *aks- "axis." Âsé, from Pers. dialects: Qâyeni asak "the shaft connecting the plough to the yoke," Lori esi "a pillar (used to put up a tribal tent)," variants hosi, hosin, Tabari âssen "the foot of a door on which it turns," cf. Skt. ISA- "pole or shafts of a carriage or plough," Av. aêša "the two shafts," Mod.Pers. xiš "plough(share)," Gk. oiax "handle of rudder, tiller, helm," PIE base *ei-, *oi- "pole, thill." |
axis of rotation âse-ye carxeš Fr.: axe de rotation Same as → rotation axis and → rotational axis. |
axisymmetric hamâmun-e âse-yi, âse-hamâmun Fr.: axisymétrique Having → axisymmetry. |
axisymmetry hamâmuni-ye âse-yi, âse-hamâmuni Fr.: axisymétrie Same as → axial symmetry. |
azimuth sugân, samt Fr.: azimut Angular distance from the north point eastward to the intersection of the horizon with the vertical circle passing through the object. Azimuth is 0° for an object due north, 90° due east, 180° due south, and 270° due west. Altitude and azimuth constitute the the horizontal coordinate system. From O.Fr. azimut, from Ar. as-sumut "the directions, ways," pl. of as-samt "the direction, way." Sugân, from su "direction" + -gân direction suffix. |
azimuth circle parhun-e sugân, dâyere-ye ~ Fr.: cercle d'azimut One of great circles of the → celestial sphere which passes through the → zenith, → nadir, and the star, cutting the horizon at right angles. Same as → vertical circle. |
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