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I think your assumption that orthohydrogen and parahydrogen should have different bulk magnetic properties is dubious. Magnetic behavior is strongly dominated by electronic properties, because the Bohr magneton, $$\mu_\text{Bohr} = \frac{e\hbar}{2m_\text{electron}}$$ is larger than the nuclear magneton  \mu_\text{nuclear} = ...

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First of all, it's not universally true. Particularly with solid phases that only appear at high pressures. But the reason why it does often occur, e.g. with ice, is that as you increase the pressure, you force the atoms closer together which causes the enthalpy of the system to increase. Increasing the pressure of a liquid phase, on the other hand, does ...

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There is some arbitrary definition of "hovering," or rather the reference position where you would no longer be hovering but touching involved: Since atoms' (and molecules') electron wavefunctions extent, although exponentially decaying, to infinity, you are in a sense touching and even partially overlapping every atom at the edge of the visible universe! ...

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It is a very interesting question. First point is that even with 1 meV of energy the electron will have plenty of states. I suppose the issue is what exactly is a zero energy electron. Hotop et al. have done very nice experiments in electron scattering where they control the electron energy to below 1 meV by laser photoionization. They can then observe the ...

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