Here
is BOLTZMANN'S value—
, which always changes in one direction only;
is the universal integration constant which is the same for a terrestrial as for a cosmical system, and when it is known for one, it is known for the other; when
is known for radiant phenomena it is also known and is the same for molecular motions.
There are some general statements which indicate more or less rigorously some of the properties or features of the entropy of a state.