hystersis

Hysterisis is a term used in various fields to describe the phenomenon where the output of a system does not immediately return to its original state after the input is removed. This is often due to the system's inherent properties, such as viscoelasticity or magnetic hysteresis.

In physics, hysteresis refers to the dependence of the output on the history of the input. This means that the system's response to a change in input is dependent on the previous state of the system. A classic example of hysteresis in physics is the B-H curve, which describes the relationship between the magnetic field strength and the magnetic flux density in a ferromagnetic material.

In engineering and materials science, hysteresis is often encountered in materials that exhibit viscoelastic behavior, such as rubber or polymers. These materials can display nonlinear elastic and viscous behavior, leading to hysteresis loops when loaded and unloaded.

In economics, hysteresis refers to the concept that economic shocks or events can have persistent effects on the economy, even after the initial shock has passed. This means that the economy may not return to its original state, but instead settle into a new equilibrium.

The term "hysterisis" may also be associated with the historical medical theory of hysteria, which described a condition where women were thought to experience a range of symptoms, including anxiety, depression, and physical symptoms, due to a supposed imbalance of bodily humors. However, this term is no longer used in modern medicine and is now considered a relic of pseudoscientific thinking.