o**o
发帖数: 21 | 1
热力学里有个Maxwell妖的问题．
信息论中解决这个问题的证明说热力学的熵和信息的熵是等价的，Maxwell妖只不过
用信息的熵补偿了热力学的熵，所以并没什么妖得了不得的地方．
不知道还有别的什么科目讨论过熵，想来也是可以证明和热力学和信息论的熵等价的吧． | q*****m
发帖数: 73 | 2
Maxwell Ghost is: you have a ghost that controls a door, when
a fast atom comes, the ghost let it in. Otherwise you close
the door and let slower atoms out. The net effect you'll have
is reduced entrophy(熵). This is the famous Maxwell Ghost
Paradox since the second law is violated.
Later it is found that for your ghost to work, it must have
a detector to determine the speed of the atom, ie the ghost
must use some energy. Therefore, you can't reduce the total
entrophy(熵), hence the Second Law of |
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