A standard cubic foot is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit and either 14.696 pounds per square inch (1 atm) or 14.73 PSI (30 inHg) of pressure. See standard temperature and pressure. Fahrenheit is a temperature scale named after the German physicist Gabriel Fahrenheit (1686–1736), who proposed it in 1724. ... A pressure gauge reading in PSI (red scale) and kPa (black scale) The pound-force per square inch (symbol: lbf/in2) is a non-SI unit of pressure based on avoirdupois units. ... View of Jupiters active atmosphere, including the Great Red Spot. ... Inches of mercury or inHg is a non SI unit for pressure. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... Temperature and air pressure can vary from one place to another on the Earth, and can also vary in the same place with time. ...
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 lbmols, or 1.19804 gram moles, equivalent to 0.026853 normal cubic metres. The cubic foot (symbols ft³, cu. ... The cubic meter (symbol m³) is the SI derived unit of volume. ... An ideal gas or perfect gas is a hypothetical gas consisting of identical particles of negligible volume, with no intermolecular forces. ... The mole and its simple conversions into different units of measurements. ...
In industry and commerce, it is necessary to define the standard reference conditions of temperature and pressure when expressing a gas volume or a volumetric flow rate because the volume of a gas varies with the temperature and pressure of the gas.
In aeronautics and fluid dynamics the term "International Standard Atmosphere" is often used to denote the variation of the principal thermodynamic variables (pressure, temperature, density, etc.) of the atmosphere with altitude at mid latitudes.
During those same years, the most commonly used standard reference conditions for people using the Imperial or customary USA system of units was 60 °F (520 °R) and 14.696 psia (i.e., 1 atmosphere of absolute pressure) because it was almost universally used by the oil and gas industries worldwide.
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