Changes

This state is called maximum entropy and is said to be in perfect disorder (although intuitively its uniformity would seem to be a state of perfect order) because it has become impossible to determine what happened in the past.  ''i.e.'' There are an infinite number of ways (histories of the universe) maximum entropy could have been reached.

This state is called maximum entropy and is said to be in perfect disorder (although intuitively its uniformity would seem to be a state of perfect order) because it has become impossible to determine what happened in the past.  ''i.e.'' There are an infinite number of ways (histories of the universe) maximum entropy could have been reached.

==The types of systems governed by the Law==

==The three types of systems governed by the Law==

There is only one type of system that the Second Law of Thermodynamics applies to: an isolated system. An isolated system is one that does not exchange matter or energy with its surroundings.

There are three different types of systems that the Second Law of Thermodynamics can apply to:

The Second Law of Thermodynamics does not strictly apply to the following types of system:

* Isolated system - Does not exchange matter or energy with its surroundings

* Closed system - Exchanges energy, but not matter, with its surroundings

* Closed system - Exchanges energy, but not matter, with its surroundings

* Open system - Exchanges both matter and energy with its surroundings

* Open system - Exchanges both matter and energy with its surroundings

==Liberal abuse of the second law of thermodynamics==

==Liberal abuse of the second law of thermodynamics==