What does chloromethane mean?
Chloromethane is a colourless, flammable gas with the chemical formula CH₃Cl and a faintly sweet odour, known industrially as methyl chloride. As the simplest member of the chlorinated-hydrocarbon family — a single carbon atom bearing three hydrogens and one chlorine — it serves mainly as a raw material for manufacturing silicones and as a methylating agent that transfers a methyl group onto other molecules. Unusually for an industrial chemical, chloromethane is also generated naturally: seaweed, plankton, salt marshes, and biomass burning together release substantial quantities into the atmosphere each year, making it one of the most abundant halocarbons in the air. Because inhalation can depress the central nervous system, its handling is tightly regulated. The word appears almost exclusively in technical writing — chemistry papers, safety data sheets, and environmental reports — where precision about which chlorinated compound is meant matters greatly.
nounA colourless, flammable gas, CH₃Cl, with a faint sweet odour; it is the simplest chlorinated hydrocarbon and is used chiefly in the industrial production of silicones and as a methylating agent.
- The colourless, flammable gas CH₃Cl (also called methyl chloride), used industrially to make silicones, tetramethyllead, and other chemicals, and produced in small quantities by marine organisms and biomass burning.
"Chloromethane is released naturally by marine algae as well as being manufactured for industrial use."
"Regulators limit workplace exposure to chloromethane because the gas can affect the central nervous system."
"Scientists measuring atmospheric chemistry found that coastal kelp forests are significant natural emitters of chloromethane."
Rarely pluralised; as a mass noun referring to a substance it normally takes no plural. A plural would appear only when counting distinct isotopic or substituted variants, which is uncommon outside specialist literature.
"Mass spectrometry can distinguish isotopically labelled chloromethanes in the sample."
The oceans breathe out thousands of tonnes of chloromethane every year — seaweed and plankton make this industrial chemical all on their own.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chloromethane
The word combines 'chlor(o)-', from Greek 'chlōros' meaning pale green, the element-name prefix introduced with chlorine in the early nineteenth century, with 'methane', coined from 'methyl', itself from Greek 'methy' (wine) via German Chemie nomenclature of the 1830s–60s. It thus belongs to the family of systematic chemical names built from these roots alongside chloride, chloroform, and ethane.
How chloromethane is actually used
A technical term used almost exclusively in chemistry, environmental science, and occupational-health contexts; in everyday speech the older name 'methyl chloride' remains common in industry.
Easily confused with chloromethane
Chloroethane (C₂H₅Cl) contains two carbon atoms and was formerly used as a topical anaesthetic, whereas chloromethane has only one.
Dichloromethane (CH₂Cl₂) bears two chlorine atoms per molecule and is a liquid solvent, while chloromethane carries a single chlorine and is a gas.