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Standard cubic foot
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A standard cubic foot (abbreviated as scf) is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit and either 14.696 pounds-force per square inch (1 atm or 101.325 kPa) or 14.73 psi (30 inHg or 101.6 kPa) of pressure. See standard temperature and pressure.
A standard cubic foot is thus not a unit of volume but of quantity, and the conversion to normal cubic metres is not the same as converting cubic feet to cubic metres (multiplying by 0.0283168...), since the standard temperature and pressure used are different.

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Encyclopedia
A standard cubic foot (abbreviated as scf) is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit and either 14.696 pounds-force per square inch (1 atm or 101.325 kPa) or 14.73 psi (30 inHg or 101.6 kPa) of pressure. See standard temperature and pressure.
A standard cubic foot is thus not a unit of volume but of quantity, and the conversion to normal cubic metres is not the same as converting cubic feet to cubic metres (multiplying by 0.0283168...), since the standard temperature and pressure used are different. Assuming an ideal gas, a standard cubic foot using the present convention of 14.73 psi represents 0.0026412 pound moles, or 1.19804 gram moles, equivalent to 0.026853 normal cubic metres.
Trillion cubic feet, commonly abbreviated as Tcf, is used in the oil and gas industry. The term trillion here refers to , the short scale definition.
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