Abstract
The experiments were carried out connected with nitrogen adsorption on coal samples. The aim was to find out the power source for coal and gas outburst. The experimental data were fitted by the function of f(x)=axb. The total volume of micropores and the degree of micropore volume filled by nitrogen were calculated by the Dubinin-Radushkevich equation. In unexploited coal body, the gas desorption occurs in a unit, it could trigger a desorption of the neighboring units of coal body. When it reaches a certain level that can push the coal body forward, the coal and gas outburst would happen. For materials containing micropores and mesopores, like coal, the inflection point was the demarcation point of micropore filling and adsorption of multilayer.
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