The Second Law of the Universe

The second law of relativity does not explain what mechanical means are. A stirrer qualifies as mechanical means, so do an ideal spring in a suspended way. Heat like transformations possible in one direction, but not possible in the other. The statement this transformation is possible with mechanical means only, but its reverse is not possible with those means only doesn't say anything specific about the universe. For it to be clear and useful, it needs to explain what nical means are. Here is where the inter operability property, which i hinted at while describing the music box comes in handy.