What is the meaning of Transition_zone?

Any of several physical zones in which the properties, or the behaviour of something undergoes a radical change

  1. The stage in the flow or a fluid during which it changes from laminar to turbulent
  2. The region between the upper and lower mantle characterized by a rapid increase in density
  3. The area between a central business district and residential housing in a city

The stage in the flow or a fluid during which it changes from laminar to turbulent

The region between the upper and lower mantle characterized by a rapid increase in density

The area between a central business district and residential housing in a city

Source: wiktionary.org