Where \ epsilon is the relative permittivity, and \ mu is the relative permeability of the material ( 1 : the glass block, 2 : the metal film ).
22.
However, apparent relative permeabilities larger than 1 have been obtained since the Darcean approach disregards the viscous coupling effects derived from momentum transfer between the phases ( see assumptions below ).
23.
Ingrain's advances in 3D imaging technology provide oil and gas companies with comprehensive and accurate measurements of reservoir rock properties including porosity, absolute permeability, electrical conductivity, elastic properties and relative permeability.
24.
These behave in the opposite manner to normal magnets owing to their relative permeability of " ? " " r " < 1 ( i . e . negative magnetic susceptibility ).
25.
In the electromagnetic cgs system, electric current is a fundamental quantity defined via Amp�re's law and takes the permeability as a dimensionless quantity ( relative permeability ) whose value in a vacuum is unity.
26.
NOTE : In the above relations, \ mu is relative permeability " ?" r, which is the ratio of the permeability of a specific medium to the permeability of free space " ?" 0:
27.
Scholars Alex Mayer and S . Majid Hassanizadeh define LNAPL transmissivity as the " product of the porous medium permeability and the LNAPL relative permeability, which in turn is a function of saturation, and the thickness of the LNAPL ".
28.
Given the relative permeability of a material can vary from around 250 for cobalt to around 5000 for soft iron and 7000 for silicon-iron, the choice of magnetic core can therefore have an important impact upon the strength of a magnetic lock.
29.
It is measured in amps per metre, and is converted into flux density ( B in Tesla ) by the permeability of free space ( ? 0, 4? ? 10-7 ) multiplied by the relative permeability ( ? r ) of the core material.
30.
The magnetic susceptibility \ chi is assumed to be scalar in this first estimation and may be calculated by \ chi = 3 \ frac { \ mu _ r-1 } { \ mu _ r + 2 }, where \ mu _ r is the relative permeability.
