This concept is widely used in various fields, including physics, chemistry, and stochastic processes, to study the behavior of systems over time.
Similar theorems have been discovered in other fields, and in physiology it was earlier known as one of the Stewart-Hamilton equations (which is used to estimate the blood volume of organs).
If the motions of the particles are looked upon as realizations of one and the same stochastic process, it is meaningful to speak of the mean value of this sojourn time.
2) Physics: Used to describe trapping times in potential wells or energy barriers in molecular dynamics.
3) Markov Chains: Describes the time a system spends in a transient state before transitioning.