Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Can entropy be decreased

  1. Jan 13, 2016 #1

    TT0

    User Avatar

    I forgot where I saw it but recently I saw somewhere that entropy decreases in endothermic reactions. On other sites however, they say that entropy can only increase and not decrease. Can someone tell me which is right?

    Thanks
     
  2. jcsd
  3. Jan 13, 2016 #2
    Both are right. The entropy of a closed system can increase of decrease, depending on what is done to it between its initial equilibrium state and its final equilibrium state. But, for the system plus the surroundings as a whole, the combined entropy can only increase (or in a reversible process, stay constant).
     
  4. Jan 14, 2016 #3

    TT0

    User Avatar

    I see, thanks
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Can entropy be decreased
  1. Decrease in density (Replies: 2)

Loading...