FACTOID # 2: Puerto Rico has roughly the same gross state product as Montana, Wyoming and North Dakota combined.
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Encyclopedia > Magnetic constant

The magnetic constant (μ0) is the permeability of vacuum. It is a physical constant not defined by other physical constants. In electromagnetism, permeability is the degree of magnetisation of a material that responds linearly to an applied magnetic field. ... For other uses, see vacuum cleaner and Vacuum (musical group). ... In science, a physical constant is a physical quantity whose numerical value does not change. ...

In SI units, the value is exactly expressed by: The International System of Units (abbreviated SI from the French language name Système International dUnités) is the modern form of the metric system. ...

μ0 = 4π · 10-7 N / A2

The newton (symbol: N) is the SI unit of force. ... The ampere (symbol: A) is the SI base unit of electrical current equal to one coulomb per second. ...


  • NIST - CODATA 2002 recommended values - magnetic constant. URL accessed on August 31, 2005.



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