hysteresis
"Hysteresis is like on at 300 off at 304 like in heaters or air conditioners. If you on-off at sharp 300 there is a chatter or oscillation. This is called dead-band in temperature control. In above example 304-300=4 is the dead-band."
"Hysteresis (hysteresis is like a "memory" of the material, if you press down rubber disks, they tend to back to it's normal uncompressed state as the load of fingers is relieved of structural material, for example the compression of rubber disks, stretching of rubber bands and cords, bending of steel springs, or twisting of torsion bars. Hysteresis is the tendency for otherwise elastic materials to rebound with less force than was required to deform them. "
that doesn't return to its original shape.
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