An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 23 Search : factor
reflection factor
  کروند ِ بازتاب   
karvand-e bâztâb

Fr.: facteur de réflexion   

The ratio of total flux that is reflected from a surface to the incident flux. Also called reflectance, reflectivity.

reflection; → factor.

scale factor
  کروند ِ مرپل   
karvand-e marpel

Fr.: facteur d'échelle   

Math.: A number which scales, or multiplies, some quantity. In the equation y = Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x.
Geometry: The ratio of any two corresponding lengths in two similar geometric figures. The ratio of areas of two similar figures is the square of the scale factor.

scale; → factor.

Stokes friction factor
  کروند ِ مالش ِ استوکس   
karvand-e mâleš-e Stokes

Fr.: facteur de friction de Stokes   

For the translational motion of a spherical body moving in a → viscous fluid, the proportionality factor between the uniform flow velocity far from the sphere and the drag force, provided no-slip boundary condition and small → Reynolds numbers: f = 6πηR, where η is the Reynolds number and R radius of the sphere.

Stokes; → friction; → factor.

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