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A cubic metre (m 3) is a measurement of gas volume. Thus, the difference between an m3 measurement and a GJ measurement is that GJs refer to the energy content of the gas while m3 refers to the volume of gas. The reference conditions for a cubic metre of gas are a temperature of 15°C and an atmospheric pressure of 101.325 kilopascals (kPa).
Natural Gas is usually measured by volume and is stated in cubic feet. A cubic foot of gas is the amount of gas needed to fill a volume of one cubic foot under set conditions of pressure and temperature.To measure larger amounts of natural gas, a "therm" is used to denote 100 cubic feet, and "mcf" is used to denote 1,000 cubic feet.
Natural gas can be measured by energy content or volume in metric or imperial units. Natural gas energy content is typically measured in Gigajoules (GJ), a metric energy measure. The imperial measure is one Million British Thermal Units (MMBtu). A GJ has a heat value of approximately 0.948 MMBtu s.
Natural gas is generally measured in one of two ways – by volume or by energy content. Gas is metered based on volume. Units typically used are cubic feet (cf), thousands of cubic feet (Mcf), millions of cubic feet (MMcf), billions of cubic feet (Bcf), and trillions of cubic feet (Tcf), or in the metric system cubic meters (cm), thousands of cubic meters (103m3), and billions of cubic meters ...
Quantities of natural gas are measured in standard cubic meters (cubic meter of gas at temperature 15 °C (59 °F) and pressure 101.325 kPa (14.6959 psi)) or standard cubic feet (cubic foot of gas at temperature 60.0 °F and pressure 14.73 psi (101.6 kPa)), 1 standard cubic meter = 35.301 standard cubic feet.
To fully understand the natural gas industry, one must also understand the various units by which natural gas is measured. For example, if you ask someone how much gas U.S. consumers use in a year, they’ll tell you it’s about 25 Bcf. Or if you ask someone what the wholesale price of natural gas is right now, they’ll say something like $3. ...
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We measure natural gas by volume converted to a measure of energy. The metric standard for energy content is joules. Relating gas volume consumption to heat and temperature, approximately 4.2 joules is equal to the heat needed to raise the temperature of one gram of water by one degree Celsius at standard pressure 101.325 kPa and standard temperature (15 degrees Celsius).