单词	retentivity
释义	retentivity /ˌriːtɛnˈtɪvɪti / noun (plural retentivities) Physics The ability of a substance to retain or resist magnetization, frequently measured as the strength of the magnetic field that remains in a sample after removal of an inducing field: iron is easily magnetized but has low retentivity [count noun]: a retentivity of about 10,000 gauss... Note that residual magnetism and retentivity are the same when the material has been magnetized to the saturation point. Another serious problem concerning erase heads used in conjunction with record/write heads is that of magnetic retentivity.
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