[quote=@Webmaster]
[@DarkwolfX37]

Enthalpy is just total heat in a system, system being defined by whomever is running the test. There's no reason pressure or volume has to decrease as heat is added.
But anti-energy that exists in the same manner as antimatter can't exist in any universe with classical matter because they're two dissimilar things. It'd be like saying that because there are green and red apples, there are green and red oranges because they're both fruits.
I would appreciate it if you expounded on the "infinity problem," but the issue is mathematically bound rather than physically bound. I won't argue that other universes can't have different constants because they're not found in ours, but I will argue that there are very few if any circumstances where different sets of constants fit together mathematically and create a functioning universe. Is life even viable on a theoretical universe with different constants? That decreases the odds even more since the System automatically filters out lifeless universes. It becomes a huge puzzle and there just may not be another set of physical properties that logically and mathematically fit together in a way that doesn't end in a universe ripping apart or fitting together. That notwithstanding, there also has to be some standard of physical laws as they apply to outside of dimensions since that space does exist.
To be fair, Seth's ability has different specifics when compared to Ma'at's. There's a lot of overlap, but also enough difference. I can accept that she can affect these things like that, but I'm also wary that it's as simple as throwing a -1 against the properties.
The issue with noticing opposite spins is that you have to have the matter atom to compare it to. If antihydrogen spins the opposite way when compared to hydrogen, she'd first have to have a case of hydrogen and compare it to the spins of all antihydrogen atoms she encounters. Not to mention that there are other factors that could potentially define antimatter that makes it more difficult to compare. A bulk of it comes from the fact that there are simply so many atoms in matter, but also that on a physical level, antimatter is indistinguishable from regular matter when not directly compared.
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"a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume."
True, but the point I'm making is that it's something to factor in with Codex, since they ignore universe-specific rules. 
There are an infinite number of dimensions, therefor there is an infinite number of dimensions with a given set of traits, but also an infinite number without those traits. Since infinity = infinity, the total is always 50% with and without. 
There are countless other functioning possibilities. Plus X to everything, for example. Yet there are also countless that we simply can't fathom or imagine because we live in a universe with the rules that we do, and simply don't have the capability to imagine ones so different. That limitation doesn't mean they can't exist, and that limitation isn't in play in the canon because of that. Yes, life is viable in nearly any universe, it doesn't have to be carbon based life or life we can fathom or imagine. Further, the System can't possibly filter out all universes without life because not only is that mathematically impossible, and not only would the universe simply come back due to the infinity problem, but also because at some point EVERY universe has no life. "Capability for life" is fine, but remember that the System was dismantled by Dynamo.
The standard outside of universes, canonically, is in flux constantly until something from a universe comes to it at which point it locally matches the rules natural to that something. This is why strategic methods are to send someone to another universe with reversed properties rather than to outside of a dimension in order to harm them. 
It's not in actuality as simple as throwing a -1 against it, that's just an example to make it easier to understand, since otherwise we'd have to go over an entirely new set of concepts just to explain it. 
I don't necessarily agree. She knows what direction matter spins from interacting with it so much, so simply noticing that it's not the spin of matter would work without needing the exact counterpart at the same time.
That's fair enough. Though it's difficult to believe that very many of those traits aren't actualized vectors or at least easily sensible via them.