Isolated System

“In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time.”

The question I have to this, is can you name one isolated system. The way isolated systems are described is: 

(1) a thermodynamic system which is completely enclosed by walls through which can pass neither matter nor energy, though they can move around inside it.

Now the question is what would such walls be made off where there is absolutely zero passing of energy or matter. Note that there is a huge difference in what we can measure and what actually happens. What we can measure is an expression of the ideas from the past. Again and again we find later that those ideas had issues, and that those measures were not as relevant as we had thought. 

(2) a physical system so far removed from others that it does not interact with them, though it is subject to its own gravity. Usually an isolated system is free from effects of long-range external forces such as gravity. The walls of an isolated thermodynamic system are adiabatic, rigid, and impermeable to matter.

Far removed from what? While it’s simple to park your car way from your building, it is not so with forces. When we say forces, that could mean so much more than the theories we know today. With that in mind, how could you ever make something far removed, when we are severely limited with your ability to understand the physical world. Severely limited means that we are limited by whichever popular theories there are at any given point in time. 

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