When an object cools down, heat is withdrawn from it. Does the entropy of the object decrease in this process? If yes, is it a violation of the second law of thermodynamics stated in terms of increase in entropy?
Answers
Answer:
When heat is taken out from object, entropy of the object decreases. But it is not a violation of second law of thermodynamics. Second law states that entropy of universe always increases and not of the system. Entropy of universe = entropy of system + entropy of surrounding.
Explanation:
Explanation:
When an object cools down, it takes away heat. Hence the object's entropy diminishes. But the decrease in entropy contributes to energy transfer to the surrounding environment. The second law is not breached here, which states that as the net entropy increases, the entropy of the universe always increases.
We know that
Total entropy is equal to sum of object entropy and entropy of surrounding
Total entropy = Object entropy + Entropy of surrounding area