Natural gas is, for example, a cubic meter of gas, which is a word on the table

0.7 ~ 0.75 kg/m3

material

Natural gas is a mixture, not pure methane, so the density is not constant even in the standard state.

The following contents are transferred from China Mining Network.

(4) Physical properties of natural gas

Natural gas is colorless and tasteless. When natural gas is mixed with hydrogen sulfide gas, it will have a strong pungent smell. Its important physical characteristics also include:

1) Density The density of natural gas refers to the weight of gas in unit volume, and the unit is kg/m3. Natural gas is a multi-component mixture, and the density of each component is different. Under ground standard conditions, the density of natural gas mixture is generally 0.7 ~ 0.75 kg/m3, which increases with the increase of heavy hydrocarbon content. The density of associated gas in some oilfields can reach 1.5 kg/m3. The density increases with the increase of pressure and decreases with the increase of temperature.

The relative density of natural gas refers to the ratio of natural gas density to air density at the same temperature and pressure (such as 15.6℃, 10 1 325Pa or 20℃, 10 1 325Pa). Natural gas mixture is generally between 0.56 ~ 1.0.

2) Viscosity of natural gas refers to the frictional resistance of particle migration in gas molecules, which is an important parameter for studying natural gas migration, evaluating exploitation and gathering and transportation conditions. Usually expressed by dynamic viscosity (absolute viscosity), the unit is MPa s. You can also use kinematic viscosity, that is, the ratio of dynamic viscosity to density in mm2/s. Viscosity is related to chemical composition and its environment. Under standard conditions, with the increase of temperature, molecular weight increases, viscosity decreases and viscosity increases. Under high pressure, the viscosity increases with the increase of pressure.

3) Compressibility and solubility of natural gas Natural gas is compressible. The density and weight of the same volume of natural gas are different on the ground and underground. Natural gas has the ability to dissolve in two different liquids, water and oil, but it is soluble in oil but insoluble in water. For example, the solubility coefficient of methane in crude oil is 0.3, while the solubility coefficient in water is only 0.033, and the difference between them can reach an order of magnitude. The main factor affecting the solubility of natural gas is pressure, and the influence of temperature on the solubility of natural gas is more complicated.