Basics
摘要
A system in a completely uniform state (pressure P, temperature T, chemical composition X) is designated as a homogeneous phase P. A heterogeneous system consists of several phases and their phase boundaries. A phase can be composed of different components K. Reactions R can occur in a system which are constrained by conditions B, such as stoichiometric conditions. The total number of variables required for the unambiguous description of the system.