| 单词 | permeability |
| 释义 | permeability(magnetic permeability) Symbol µ. The ratio of the magnetic flux density, B, in a substance to the external field strength, H; i.e. µ = B/H . The permeability of free space, µ0, is also called the magnetic constant and has the value 4π × 10-7 H m-1 in SI units. The relative permeability of a substance, µr, is given by µ/µ0 and is therefore dimensionless. See magnetism |
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