AskDefine | Define retentivity

Dictionary Definition

retentivity n : the power of retaining liquid; "moisture retentivity of soil" [syn: retentiveness, retention]

Extensive Definition

The retentivity of a material is its capacity to remain magnetized after the external magnetizing field has ceased to exist.
A material with high retentivity (i.e. iron) will keep some magnetic properties, it will become a permanent magnet, whereas a material with low or no retentivity will not keep the magnetic properties—it will lose its magnetization.
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