Fr.: facteur de réflexion
The ratio of total flux that is reflected from a surface to the incident flux. Also called reflectance, reflectivity.
Fr.: facteur d'échelle
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.
Stokes friction factor
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.