The Second Law of Thermodynamics states that this quantity will always increase in an irreversible process.
For a black hole, this quantity is proportional to the surface area of the event horizon. The Sackur-Tetrode equation allows one to calculate this quantity for a monatomic ideal gas, while a better known definition states that it is equal to Boltzmann's constant multiplied by the natural logarithm of the number of accessible states. The Second Law of Thermodynamics states that this quantity will always increase in an irreversible process. For 10 points, what state function, symbolized S, is the measure of disorder in a system?
For a black hole, this quantity is proportional to the surface area of the event horizon.
{entropy}