The Ornstein theorem states that Bernoulli schemes which have equivalent values for this are isomorphic, while another type of this is given by the logarithm of the covering number, and is named for Kolmogorov. One form of this quantity useful in information theory is named for Claude Shannon, and for an ideal monoatomic gas it is given by the Sackur-Tetrode equation. For an irreversible process, 
The Ornstein theorem states that Bernoulli schemes which have equivalent values for this are isomorphic, while another type of this is given by the logarithm of the covering number, and is named for Kolmogorov. One form of this quantity useful in information theory is named for Claude Shannon, and for an ideal monoatomic gas it is given by the Sackur-Tetrode equation. For an irreversible process, this quantity is always greater for the system and its surroundings according to the second law of thermodynamics. For 10 points, identify this quantity which describes the degree of disorder of a system, usually represented by the letter S.
The Ornstein theorem states that Bernoulli schemes which have equivalent values for this are isomorphic, while another type of this is given by the logarithm of the covering number, and is named for Kolmogorov.
{entropy}