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permittivity [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-05-31

English

Subject field(s)
  • Electromagnetic Radiation
  • Metrology and Units of Measure
DEF

The electrical characteristic of a dielectric in relation to the surrounding electrostatic field.

OBS

A dielectric material is a substance that is a poor conductor of electricity, but an efficient supporter of electrostatic fields. Most dielectric materials are solid. Such examples include porcelain (ceramic) mica, glass, plastics, and the oxides of various metals. Liquids and gases can also serve as good dielectric materials: dry air (used in variable capacitors and some types of transmission lines), or a vacuum.

OBS

permittivity: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Unités de mesure et métrologie
DEF

Coefficient qui caractérise un corps isolant (ou diélectrique).

OBS

Un matériau diélectrique tel le vide, l'air ou le mica ne conduit pas le courant électrique.

OBS

permittivité : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Radiación electromagnética
  • Metrología y unidades de medida
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Record 2 1991-01-17

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
  • Man-Made Construction Materials
  • Soil Mechanics (Engineering)
DEF

For a geotextile, the volumetric flow rate of water per unit cross-section area, per unit head, under laminar flow conditions, in the normal direction through the fabric.

CONT

The Committee [on Geotextiles, Geomembranes, and Related Products] has defined permittivity of a geotextile as the volumetric flow rate of water per unit cross-sectional area per unit head under laminar flow conditions, in the normal direction through a geotextile.... Calculated using the Darcy equation, permittivity is actually the coefficient of permeability divided by fabric thickness.... Permittivity values provide a fair comparison of permeability between fabrics and also allow for calculation of a Darcy's coefficient of permeability if necessary.

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
  • Matériaux de construction artificiels
  • Mécanique des sols
DEF

Drainage. Tous les géotextiles présents sur le marché ne sont pas en mesure de remplir cette fonction. Leur permittivité "P", c'est-à-dire leur aptitude à laisser percoler l'eau, devra être suffisante et compatible avec le milieu environnant pour ne pas opposer à l'eau venant du sol une résistance à la pénétration.

Spanish

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