Abstract
In [i-4] we tried to describe the methane-bearing coal stratum as a methane-coal solid solution. The question of migration of methane within such a system remained unresolved. Complete absence of migration in a methane--coal equilibrium system is impossible. Because of spontaneous fluctuations, there will always be localized ruptures of the bonds between the methane molecules and the coal substance. Due to the migration of the defects in the system, CH~ molecules will have a 'degree of freedom' at certain times. In the assumed analagous model of aerated water (champagne), the migration of the dissolved gas molecules occurs along the system defects. In the liquid medium, the defects were instantaneously closed up, so migration was not observed. It is obvious that small bubbles will combine to form larger bubbles, which are able to rise, overcoming the viscosity of the liquid medium.
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