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| the direct effect that one kind of particle has on another in inducing the emission or absorption of one particle by another |
| the property of a fluid that resists the force tending to cause the fluid to flow; the measure of the extent to which a fluid possesses this property |
hysteresis hys·ter·e·sis (hĭs'tə-rē'sĭs)
n. pl. hys·ter·e·ses (-sēz)
The lagging of an effect behind its cause, as when the change in magnetism of a body lags behind changes in the magnetic field.
| hysteresis (hĭs'tə-rē'sĭs) Pronunciation Key
The dependence of the state of a system on the history of its state. For example, the magnetization of a material such as iron depends not only on the magnetic field it is exposed to but on previous exposures to magnetic fields. This "memory" of previous exposure to magnetism is the working principle in audio tape and hard disk devices. Deformations in the shape of substances that last after the deforming force has been removed, as well as phenomena such as supercooling, are examples of hysteresis. |