Physics Help Forum Why does Entropy always increase?

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Sep 30th 2017, 06:58 AM #1 Member   Join Date: Feb 2017 Posts: 55 Why does Entropy always increase? Answer: If there's one right way to put something together, there are many wrong ways to do it. For example, if you pick up all the pieces of a jigsaw puzzle that you accidentally dropped on the floor and quickly put them right side up on the table, you don't expect the puzzle to be put together the right way. There is only one correct way to put the pieces together and very many incorrect ways. Chances are you won't put them together the right way the first time. But if this is the case then there are a few ways by which things are put in order. Suppose you take a jigsaw puzzle and randomly just put it together without looking and luckily it turns out that you have solved the jigsaw puzzle then entropy has decreased. Does this mean entropy can sometimes decrease? If there are a few ways of putting something in order then there are chances that entropy decreases. Suppose you want to arrange your sofa and you have a few options and when you arrange the sofa in the right way you have decreased the entropy. So does that mean entropy can decrease?
 Sep 30th 2017, 08:40 AM #2 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 613 See my reply to your zigsaw puzzle question. We can work it all out there. topsquark likes this.

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