Calvin Hobbes (Kermephat) Offline

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So how does that apply to ghosts?

The principle can be used to explain why the arrow of time only ever marches forwards; why there's a past, future, and present; and why you can't un-scramble an egg, because it would lower the Universe's entropy. Entropy is a measure of the randomness or disorder within a closed or isolated system, and the second law of thermodynamics states that as usable energy is lost, chaos increases - and without extra energy being put into a system, that progression towards disorder can never be reversed. In other words, energy is always lost to heat in any system - whether it's a washing machine or the Universe - and you can never get back all the energy you put in. Because we can't touch and interact with them, ghosts can't be made of matter, but instead of energy. And if energy is necessarily lost within every system - particularly if they're doing anything that requires using more of it, such as moving, emitting light, or making spooky sounds - it would be impossible for them to maintain their existence for any significant period of time. "I would say if there's some kind of substance that's driving our bodies, making my arms move and legs move, then it must interact with the particles out of which our bodies are made," says Cox. "And seeing as we've made high precision measurements of the ways that particles interact, then my assertion is that there can be no such thing as an energy source that's driving our bodies."
http://www.sciencealert.com/a-physicist-just-explained-why-the-large-hadron-collider-disproves-the-existence-of-ghosts