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Related to relative permeability: relative permittivity, effective permeability, absolute permeability
relative permeability[′rel·əd·iv ‚pər·mē·ə′bil·əd·ē]
The ratio of the permeability of a substance to the permeability of a vacuum at the same magnetic field strength.
Specific permeability of a porous rock formation to a particular phase (oil, water, gas) at a particular saturation and a particular saturation distribution; for example, ratio of effective permeability to a specified phase to the rock's absolute permeability.