Most of those studies neglect the difference between dissolved gas and adsorbed gas and consider both types of gas as adsorbed gas.
In hot isostatic pressing, prealloyed powders are packed into a thin-walled, collapsible container, which is placed in a high-temperature vacuum to remove adsorbed gas molecules.
The free gas and adsorbed gas flow relationship can be illustrated in Fig. 3.
Gas in shale strata is found to be present as a free gas and adsorbed gas.
The results showed that the presented model considering stimulated volume and adsorbed gas could predict the productivity of MFHW better.
In these simulations, the smaller kerogen-hosted pores act as a source term, releasing primarily adsorbed gas.
The contributions of free gas, adsorbed gas, and dissolved gas to the cumulative gas production varied with the production pressure.
Shale gas contains free gas and adsorbed gas in matrix pores.
In shale formations, the gas is found to be present together as adsorbed gas on organic matter and free gas which is present within the fractures or pores.
It usually has two states stored in shale, that is, free gas in natural cracks and adsorbed gas on the organic matter surfaces (Yin et al. 2016).
The gas sensing mechanism for the composite sensors may be explained on the basis of interactions between the sensing film and adsorbed gas.
