Natural gas density
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Help, does anyone know what the density of natural gas is at 40 degrees and 0.4 Mpa?
Calculate it using the gas equation.
Make a simple calculation using the gas equation.
Natural gas is a mixture whose main component is methane; the composition of this mixture remains within certain limits. Only by determining the mass or molar fraction of each component can its average molecular weight be determined. Once the average molecular weight is known, the density under specific conditions can be calculated using the ideal gas law. Ideal gas law: pV = RT (applicable when the gas pressure is less than 1.0 MPa). Given conditions: 40°C, 0.4 MPa; assume the average molecular weight is M = 17 g/mol. Then, ρ = m/V = nM/(nV) = M/Vm = pM/(RT). Converting to standard units: T = (40 + 273.15) K = 313.15 K; p = (0.4 + 0.1) * 10^6 Pa = 500,000 Pa. Since M = 17 g/mol = 0.017 kg/mol, we have ρ = 500,000 * 0.017 / (8.315 * 313.15) kg/m^3 = 3.26 kg/m^3
First, the density of gases is always the density at standard cubic meters, independent of the operating temperature and pressure. Second, it is necessary to know the composition of natural gas.
This post was last edited by qugd on 2016-11-19 at 10:35. First of all, the original poster’s post should be titled a request for help, not an original creation. Second, natural gas is a mixed gas; although methane is the main component, other components affect the density of the mixture. To determine the density of a gas, it is necessary to accurately describe the state of the gas and specify under what conditions the density applies, in order to carry out the calculation. The calculation of any gas density is related to its temperature and pressure. Especially when the pressure is very high, the gas deviates significantly from ideal behavior, requiring corrections to the calculations.
This post was last edited by free2_citiz on 2016-11-19 21:45. GB/T11062-1998: Methods for calculating the calorific value, density, relative density, and Wobbe index of natural gas; GB/T 31253-2014: Natural gas – Verification of gaseous reference materials – Direct measurement methods for calorific value and density; GB/T 12206-2006: Methods for determining the calorific value and relative density of urban gas
To calculate the density of natural gas, it is necessary to know its component makeup, such as the amount of methane, CO, O2, and so on