pF/m
pF/m :
The picofarad per meter (symbolized pF/m) is a unit of electric permittivity, a constant of proportionality that exists between electric displacement and electric field intensity. Permittivity is a characteristic of matter, and is important in the design and construction of capacitor s and radio-frequency (RF) transmission lines. The permittivity of a vacuum (also known as free space) is equal to approximately 8.85 pF/m. Relative permittivity can be expressed as the ratio of the number of picofarads per meter in a particular substance to 8.85 pF/m. This ratio is called the dielectric constant of a material. Free space has a dielectric constant of 1, and most substances have a dielectric constant greater than this
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