TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

The length of a straight line through the center of a sedimentary particle considered as a sphere; a common expression of particle size.  2, record 1, English, - particle%20diameter

Record number: 1, Textual support number: 1 CONT

The term particle size is the subject of considerable confusion. In some cases it is used to designate particle radius, and in other cases it designates particle diameter. The rate at which a particle settles is a function of particle diameter and density.  3, record 1, English, - particle%20diameter

Record number: 1, Textual support number: 2 CONT

If the particle is nonspherical, Stokes’ law is useful in expressing an effective diameter. Generally, the particle diameters to which we shall refer are Stokes’(aerodynamic) diameters. Often the density of a particle is not known. Frequently, therefore, an arbitrary value of 1 g/cm[ superscripted] 3 is assigned.  4, record 1, English, - particle%20diameter

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

La forme, la nature (indice de réfraction), la réponse non univoque pour certaine dimension de particules, viendront souvent entacher d'erreur la mesure. Enfin, on notera que le diamètre mesuré est un diamètre optique équivalent à un aérosol de référence [...] avec lequel l'appareil doit être impérativement étalonné. La relation avec le diamètre aérodynamique caractérisant le comportement réel des aérosols est parfois très délicate à obtenir.  1, record 1, French, - diam%C3%A8tre%20de%20particule

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

For spherical particles greater than approximately 1 [micron] in diameter, Stokes’ law applies, [in an equation] where(nu] is the settling velocity in cm/sec; g is the acceleration of gravity in cm/sec2; d is the diameter of the particle in cm; [rho 1] is the density of the particle in g/cm3; [rho 2] is the density of air in g/cm3; and [êta] is the viscosity of air in poise. If the particle is nonspherical, Stokes’ law is useful in expressing an effective diameter.  1, record 2, English, - particle%20density

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Des nombreuses études menées, on retiendra un critère relativement simple pour obtenir un échantillonnage avec une erreur inférieure à 10%. [Ce critère se présente sous forme d'une équation] avec d et [rho] respectivement le diamètre et la masse volumique de la particule, [êta] la viscosité du gaz, g l'accélération de la pesanteur et Ds le diamètre d'entrée de la sonde.  2, record 2, French, - masse%20volumique%20d%27une%20particule

Record number: 2, Textual support number: 1 OBS

En français, utiliser le terme "densité" au sens de "masse volumique" est un anglicisme.  3, record 2, French, - masse%20volumique%20d%27une%20particule

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

the diameter of a hypothetical sphere having unit density and the same terminal settling velocity as the particle in question.  1, record 3, English, - Stokes%20equivalent%20diameter

Record number: 3, Textual support number: 1 CONT

Generally, the particle diameters to which we shall refer are Stokes’ (aerodynamic) diameters. Often the density of a particle is not known. Frequently, therefore, an arbitrary value of 1 g/cm3 is assigned to the density of the particle.  3, record 3, English, - Stokes%20equivalent%20diameter

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Diamètre d'une sphère de masse volumique 1 g.cm-3 dont la vitesse de chute est la même que celle de la particule dans les mêmes conditions de température et d'humidité relative.  1, record 3, French, - diam%C3%A8tre%20a%C3%A9rodynamique%20d%27une%20particule

Record 3,  Textual support,  Spanish