From: ram@zedat.fu-berlin.de   
      
   Sylvia Else  writes:   
      
   >No. Entropy is not similar to energy. Rather it is a measure of the   
   >disorder in a system. It's not something that can be extracted and sent   
   >elsewhere.   
      
     Entropy is an extensive property of a system, similar to   
     momentum. As such, it /can/ be exchanged. A change dS of   
     entropy S is connected with a change T dS of heat energy,   
     where T is the temperature of the system. When entropy dS   
     is leaving a system, it has to go somewhere (into another   
     system). That's pretty much "extracted and sent elsewhere".   
     Such an exchanged is caused by a difference in temperature   
     at the boundary of two systems. The entropy will move from   
     the system with the higher temperature to the system with   
     the lower temperature.   
      
     Unlike for momentum, there is only half a conservation law   
     for entropy. While entropy cannot be reduced in a closed   
     system, it /can/ be created. When entropy is exchanged,   
     in the process, there might be additional entropy created.   
     When the temperature difference between two systems is   
     smaller, there is less entropy created in the exchange.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)