prov:value
| - The gas used in this step is carbon-containing gas, for example a hydrocarbon such as methane, ethane, propane, ethylene, benzene or acetylene; a halogenated-carbon such as methylene chloride, carbon tetrachloride, chloroform or trichloroethane; and alcohol such as methyl alcohol or ethyl alcohol; or gas such as CO2 or CO and inert gas such as N2, H2, O2, H2 O or Ar.
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