In this framework, they review and partially try to replace previous theories regarding the thermodynamics of a hypothetical Maxwell's demon, although these new theories about the demon are not without criticism (see, for example, Porod et al 1984). In this line of research, the contributions of Landauer ( 1961) and Bennett ( 1982) emphasize the cost of erasing information and carry out a reinterpretation of the thermodynamics of a measurement system. Starting in the 1960s, a new twist was produced on this topic that connected thermodynamics, information and logical operations of computing processes: The history and detailed references to this twist are in Leff and Rex ( 1990). The classic works of Szilard ( 1929) and Brillouin ( 1951) tended to show that the acquisition of information by the Maxwell's demon required increasing the entropy of this hypothetical being by an amount such that the global balance of the entropy change of the system is positive and consistent with the second law of thermodynamics. The central interest of this imaginary experiment is that Maxwell found an intellectually challenging connection between thermodynamics and information, suggesting that information could be linked to entropy in a subtle way. A compilation of the most relevant contributions as well as a detailed bibliography has been edited by Leff and Rex ( 1990 and a revised edition in 2003).
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This text gave birth to Maxwell's demon and from that distant 1871 to the present day this fictitious being stimulated a remarkable and extensive series of scientific contributions. He will thus, without expenditure of work, raise the temperature of B and lower that of A, in contradiction to the second law of thermodynamics. Now let us suppose that such a vessel is divided into two portions, A and B, by a division in which there is a small hole, and that a being, who can see the individual molecules, opens and closes this hole, so as to allow only the swifter molecules to pass from A to B, and only the slower molecules to pass from B to A.
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For we have seen that molecules in a vessel full of air at uniform temperature are moving with velocities by no means uniform, though the mean velocity of any great number of them, arbitrarily selected, is almost exactly uniform.
if we conceive of a being whose faculties are so sharpened that he can follow every molecule in its course, such a being, whose attributes are as essentially finite as our own, would be able to do what is impossible to us. This experiment was described at the end of his "Theory of Heath," in the section called "Limitations of the Second Law." Let us quote this fundamental text (Maxwell 1871): In this context arose the famous thought experiment created by Maxwell around 1870. A corollary of this approach was the statistical interpretation of the increase in entropy in an isolated system. In the case of the study of statistical mechanics, this approach led to the microscopic interpretation of macroscopic variables such as temperature, pressure, viscosity or entropy. Perhaps the search for this link began with Laplace and Maxwell's brilliant idea of approaching the difficulties of knowing the detailed dynamics of highly complex mechanical systems by statistical representations of collective behaviors. Response Technologies, Inc.Understanding the link between thermodynamics and information has been one of the most challenging goals in natural science. Quantity discounts are available and dealers are welcome. Additional sleeves can be purchased so one safe can be installed in multiple locations and they can also be order keyed alike so one key can fit multiple safes.įor more information visit e-mail or call 80 to place your order. SafeBOX comes with a steel mounting sleeve and can stay locked when secured in the sleeve and anytime it is out of the sleeve and the key removed.
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