ABSTRACT
Synonym: marsh gas; formula: CH4; MW 16.04; CAS [74-82-8]; prime constituent of natural gas; formed from petroleum cracking, decay of animal and plant remains, and anaerobic fermentation of municipality land- ll contents; occurs in marshy pools, land ll gas, and leachate from the land ll; colorless and odorless gas; lighter than air; gas density 0.717 g/L; lique es at −61.4°C; soluble in organic solvents, slightly soluble in water (25 mg/L); ammable gas.
