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The Permeability of Free Space, , is also known as Permeability of a Vacuum and sometimes as the Magnetic Constant. This constant is used to measure the amount resistance to forming a magnetic field in a classical vacuum. This constant is used in a number of equations related to magnetic field density and its relationships to magnetic flux density.
The Permeability of Free Space is defined as , which is approximately:
1.2566370614359173E-6 or
1.2566370614359173E-6 or
1.2566370614359173E-6 or
1.2566370614359173E-6 or
1.2566370614359173E-6
This is an exactly known constant since it is the product of a precise value with a precisely known number, Pi.
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