Science Forums 2

[HydrogenBond]

I am writing this to stimulate discussion. If we had a huge galaxy size cloud of hydrogen gas, that had a center of gravity that was slightly denser, one would expect it to collapse/rotate due to gravity. But this assumes inert mass. As a better approximation of what should happen, let us assume the hydrogen has the properties of an ideal gas, as the second approximation.

With hydrogen a small atom and the hydrogen molecule a small molecule, there are ideal gas based countering affects relative to the direction of gravity. For example, a gas will flow from high temperature and high pressure to lower temperature and lower pressure. That means the initial center of gravity, by having extra density or gas pressure will create a potential to diffuse toward the perimeter. The center won't stay put for long but will abort as the center of gravity. There are also entropy considerations with maximum entropy being expressed if the cloud can diffuse into empty space so it can get thinning and thinning.

Gravity and the GR wells created in the fabric of space-time, are not just dependant on mass, but also mass density. Relative to the original cloud, we don't have much mass density (mass-distance), so the initial well at the center of gravity is more like a tiny puddle that will keep evaporating due to pressure and entropy of an ideal gas. Is there a critical mass density required for the ideal gas cloud before we could expect a collapse due to gravity?

The first approximation of inert mass only needs a center of gravity that is slightly denser. Mass density is not a factor. The second approximation makes the mass an ideal gas which is not exactly inert to temperature, pressure and entropy, which all outweigh gravity at low mass density. One will not expect rarefied space to suddenly form a star for example. The third approximation will add some other things. But for now, just look at and compare one and two.