A cartoon of a Szilard demon (information energy version of Maxwell demon), from the 1967 book Order and Chaos, with a negentropy flashlight, from which the demon obtains information about the movement and positions of the molecules in the room beyond the door (see also: Heisenberg uncertainty principle). [8] |
“Entropy taken with a negative sign is not my invention.”
“Every observation in the laboratory requires degradation of energy of energy and is made at the expense of a certain amount of negative entropy (abbreviation: negentropy), taken away from the surroundings.”
I = K ln P
“One remark should be added. In order to choose the fast molecules, the demon should be able to see them; but he is in an enclosure in equilibrium at constant temperature, where the radiation must be that of the black body, and it is impossible to see anything in the interior of a black body. The demon simply does not see the particles, unless we equip him with a torchlight, and a torchlight is obviously a sours of radiation not at equilibrium. It pours negative entropy into the system.”
Bound information Ib = decrease in entropy S= increase in negentropy N
“A fully living system must be capable of energy conversion in such a way as to accumulate negentropy, that is, it must produce a less probable, less random organization of matter and must cause the increase of available energy in the local system rather than the decrease demanded in closed systems by the second law of thermodynamics.”
“Leon Brillouin gave this negative entropy the name negentropy and identified it with the information received by the system. The new term, however, does not contribute any new insight, neither into entropy, nor into information. The difference in the signs of these two quantities is similar to the difference between conveyed and received heat, conveyed and received work, etc.”