Changes

OK, lets replace the coffee with pure water and add a lid to the cup so that nothing can get in or out. Let's make our container completely unreactive so that it cannot affect the water, but let it still be partially conductive. Hence '''nothing''' can happen to our water, except its temperature changing. (Assume normal pressures so there aren't phase changes. even if there were, it would be vapour condensing which would be a decrease of entropy anyway)

OK, lets replace the coffee with pure water and add a lid to the cup so that nothing can get in or out. Let's make our container completely unreactive so that it cannot affect the water, but let it still be partially conductive. Hence '''nothing''' can happen to our water, except its temperature changing. (Assume normal pressures so there aren't phase changes. even if there were, it would be vapour condensing which would be a decrease of entropy anyway)

My example still holds, I think. The entropy of the water decreases and the water is an open system. [[User:Richardm|Richardm]] ([[User talk:Richardm|talk]]) 14:24, 19 September 2016 (EDT)

My example still holds, I think. The entropy of the water decreases and the water is an open system.

 

Also, the equation for the change in entropy above is a precise mathematical equation that '''defines''' the change of entropy. [[User:Richardm|Richardm]] ([[User talk:Richardm|talk]]) 14:24, 19 September 2016 (EDT)