geology glossary

Jun 30th, 2015
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Adsorption.—The process whereby gas adheres to the internal surfaces of a coal. At low to moderate pressures—typically found at normal exploration depths of less than 2 km—this layer of gas is one molecule thick. At low pressure, there is little difference between total and adsorbed gas. Adsorption isotherm.—The gas retention capacity of a powdered coal

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Adsorption.The process whereby gas adheres to the internal surfaces of a coal. At low to moderate pressurestypically found at normal exploration depths of less than 2 kmthis layer of gas is one molecule thick. At low pressure, there is little difference between total and adsorbed gas.Adsorption isotherm.The gas retention capacity of a powdered coal sample at a constant temperature but at different pressures. Usually measured under equilibrium moisture conditions.Alluvial plain.A level or gently sloping land surface that is covered by extensive deposition of alluvium.Ash yield.Non-combustible inorganic residue remaining after a coal has been completely combusted. It represents the bulk of mineral matter in a coal after carbonates, sulfides, and clays are broken down during heating. Therefore, ash yield is less than the total mineral-matter content.Biogenic gas.Gases produced from coal by the metabolic activities of microbes.Bituminous coal.An intermediate rank humic coal whose rank as measured by vitrinite reflectance that exceeds 0.5% Ro.Canister.A gas-tight container for holding a sample as it is being desorbed.Carbonaceous mudston (carb

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