31 coal in coal, coal, what is the meaning of the 42
Coal:Coal is a kind of solid combustible mineral which is buried in the underground plants and has been formed by the complex biochemical and physicochemical changes. It is a kind of solid combustible organic rock, which is mainly made up of the remains of plants, which is formed by the action of Biochemistry
Representative of hydrogen content.On behalf of hydrogen content test indicators in more than 5 to 52 more than 4 of the coal is 42 more than 3 of the coal 31 coal coal did not call for the content of coal for industrial gas furnace of hydrogen gas is much higher output.
Coal has been hailed as the black gold, the food industry, it is one of the main sources of energy used in the human world since eighteenth Century.
