Coal Bed Methane (CBM) is a gas contained in coal layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002) | Coal Bed Methane (CBM) is a gas contained in coal layer. This gas is a fraction of coal bed gas (CBG), natural gas that produced from a coal layer. There are some others gasses that also contained in a coal layer, such as Carbon dioxide (CO2), Nitrogen (N2), and water (H2O) (Thomas, 2002) |