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Transient sorption and desorption of helium and carbon dioxide in Upper Freeport coal powder and lumps were analyzed. Differences in texture and porosity between the powder and lumps may affect the transport and interaction of the penetrant and coal. In this work, we address macroscopic and mesoscopic structural differences between powdered and non-powdered coals that influence the rates of the gas transport kinetics and changes in coal texture (swelling, shrinkage, and changes in the poredoi:10.1007/s40789-015-0098-6 fatcat:i42uyqimufadbgpt7lxf4c3wom