Question

Explain the answer

Which statement can be attributed to the 2nd Law of Thermodynamics?

		For any real process, energy is conserved.
		For any real process, entropy is conserved.
		Energy flow has a direction.
		Energy has a magnitude.

Answer 1

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Statement 1 is simply a First Law of Thermodynamics , where it states that energy can neither be created nor be destroyed , but can be interchaengable subject to their form of energy . This stament is not 2nd law of thermodynamics . Now , We all know unlike energy , entropy is not conserved . It either  increases or remains constant in any kind of process we have . Entropy is measure of disorder of the sysytem or we say a controlled volume space . Entropy is only conserved for only reversible process and not real process . Thus this statement is also not according to 2 nd law of thermodynamics  . According to 2 nd law of thermodynamics , energy flow from higher temperature to lower temperature meanwhile doing some work . In this process , energy flow has a direction . Thus this statement is according to 2 law of thermodynamics . Thus this statement is Answer . Energy has magnitude , since its a scalar quantities , but this does not imply that it is according to 2 nd law of thermodynamics .