An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



Number of Results: 16 Search : physical
axtarfiziki (#)

Fr.: astrophysiqie   

Of or pertaining to → astrophysics.

astrophysics + → -al

astrophysical jet
  شان ِ اخترفیزیکی   
šân-e axtarfiziki

Fr.: jet astrophysique   

A very fast moving, → collimated beam of → ionized gas at high temperatures associated with most classes of compact objects that spin and/or accrete matter from their surroundings, such as → protostars, → X-ray binary systems, and, at a larger scale, with → active galactic nuclei, → gamma-ray bursts, and → quasars. In general, jet sources host → accretion disks and are associated with → magnetic fields. Astrophysical jets, despite their different physical scales and power, are morphologically very similar, suggesting a common physical origin. For example, in one extreme, → active galactic nuclei jets have typical sizes ≥ 106 pc, velocities near that of light c, and parent sources (→ massive black holes) with masses 106-9  Msun and luminosities ~ 1043-48Lsun; while in the other extreme, → young stellar objects jets have typical sizes ≤ 1 pc, velocities ≤ 10-3 c, and emerge from low mass protostars with masses ~ 1 Msun and luminosities (0.1-2 × 104Lsun. Jets play an important → feedback role in the evolution of their host systems. See also: → jet launching.

astrophysical; → jet.

astrophysical object
  بر‌آخت ِ اخترفیزیکی   
barâxt-e axtarfiziki

Fr.: objet astrophysique   

An extraterrestrial → object whose physical properties and formation are studied in → astrophysics.

astrophysical; → object.

fiziki (#)

Fr.: physique   

Pertaining to the physical sciences, especially physics.

physics + → -al.

physical adsorption
  برشم ِ فیزیکی   
baršam-e fiziki

Fr.: adsorption physique   

Same as → physisorption.

physical; → adsorption.

physical chemistry
  شیمی ِ فیزیکی   
šimi-ye fiziki (#)

Fr.: chimie physique   

The branch of chemistry dealing with the relations between the physical properties of substances and their chemical composition and transformations.

physical; → chemistry.

physical condition
  بوتار ِ فیزیکی   
butâr-e fiziki

Fr.: condition physique   

The state of a → physical system regarding its temperature, density, pressure, etc. at a given time.

physical; → condition.

physical constant
  پایای ِ فیزیکی   
pâyâ-ye fiziki (#)

Fr.: constante physique   

A fundamental → physical quantity that is generally believed to be both universal in nature and constant in time.

physical; → constant.

physical dimension
  وامون ِ فیزیکی   
vâmun-e fiziki

Fr.: dimension physique   

Any of basic physical quantities, such as mass, length, time, electric charge, and temperature in terms of which all other kinds of quantity can be expressed.

physical; → dimension.

physical law
  قانون ِ فیزیکی   
qânun-e fiziki (#)

Fr.: loi physique   

A theoretical principle which is deduced from particular observational facts regarding the behavior of matter. Physical laws are expressed by a general statement that a particular → physical phenomenon always occurs if certain → conditions are present.

physical; → law.

physical libration
  هلازان ِ فیزیکی، رخگرد ِ ~   
halâzân-e fiziki, roxgard-e ~

Fr.: libration physique   

A real periodic variation in the rotation rate of a celestial object, as distinct from a → geometrical libration. In particular, slight oscillations in the → Moon's rotation caused by the → gravitational attraction of the Earth on the → equatorial bulge of the Moon's near side. The Moon's physical libration is about 0.03° in longitude and about 0.04° in latitude.

physical; → libration.

physical optics
  نوریک ِ فیزیکی   
nurik-e fiziki

Fr.: optique physique   

The branch of optics concerned with the wave properties of light, → diffraction, → polarization, and other phenomena for which the ray approximation of → geometric optics is not valid. Also called → wave optics.

physical; → optics.

physical parameter
  پارامون ِ فیزیکی   
pârâmun-e fiziki

Fr.: paramètre physique   

Any of a set of physical properties whose values determine the characteristics or behavior of a system; for example, → mass, → size, → temperature, → luminosity, etc.

physical; → parameter.

physical phenomenon
  پدیده‌ی ِ فیزیکی   
padide-ye fiziki (#)

Fr.: phénomène physique   

A natural → phenomenon that can be explained by → physical laws.

physical; → phenomenon.

physical quantity
  چندای ِ فیزیکی   
candâ-ye fiziki (#)

Fr.: quantité physique   

A physical → property that can be measured and/or calculated.

physical; → quantity.

physical system
  راژمان ِ فیزیکی   
râžmân-e fiziki

Fr.: système physique   

A set of physical components chosen to study their relations.

physical; → system.