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(his, t∂ rē’ sis)

  1. A phenomenon exhibited by a system or material in which response depends nonlinearly on past responses. A property that has been changed will not return to its original state after the cause of the change has been removed.
  2. Especially the effect where the magnetization produced by an applied field lags behind the field; see Figure H-14. This involves energy loss. When the applied field returns to zero, the residual magnetism that is retained is called remanent magnetism. The magnetic field intensity required to reduce the remanent magnetization to zero is the coercive force (or coercivity).
  3. The response of a spring gravimeter where the spring maintains the memory of its last position.