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Reference.org
Hysteresivity
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<p>Hysteresivity derives from “<a href="/facts/Hysteresis/9M2pwR62">hysteresis</a>”, meaning “lag”. It is the tendency to react slowly to an outside force, or to not return completely to its original state. Whereas the area within a hysteresis loop represents energy dissipated to heat and is an <a href="/facts/Intensive_and_extensive_properties/UcgSh8EG">extensive</a> quantity with units of energy, the hysteresivity represents the fraction of the elastic energy that is lost to heat, and is an intensive property that is dimensionless. </p>