A decatherm is a unit of heat equal to one million BTU (British thermal units) (about 1.055 gigajoules). This unit is commonly used in the energy industry, especially as a unit of measurement for natural gas. However, various sources use decatherm, BTUs and volumetric measurements such as cubic feet interchangeably, combined with unconventional hybrids of metric system and British unit conventions. The British thermal unit (BTU or Btu) is a non-metric unit of energy, used in the United States and, to a lesser extent, the UK (where it is generally only used for heating systems). ... Look up gigajoule in Wiktionary, the free dictionary. ...
Volumetrically, gas is typically measured in cubic feet or, at the wholesale level, in MMcf (million cubic feet, sometimes written Mcf), bcf (billion cubic feet) of tcf (trillion cubic feet). To convert between volume and heat content for natural gas, assume that 1000 cubic feet is equal to one million BTU, which is approximately equal to one decatherm. This is only an approximation, as the heat content of natural gas from different sources may vary. Natural gas (commonly refered to as gas in many countries, but note that this is also American and Canadian slang for gasoline) is a gaseous fossil fuel consisting primarily of methane. ...
Note: In the natural gas transportation industry, pipeline capacity is often measured in decatherms per day, while total (or expected) delivery might be measured in bcf per year.
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