Table 2 Fluid parameter table.

From: Study on the gas outflow pattern and outflow prediction model of the return mining face under complex geological conditions

Designation

Unit

Numerical value

Methane density

kg/m3

0.716

Coefficient of kinetic viscosity of methane

Pa·s

1.08 × 10−5

The gas molecular mass of methane

g/mol

16

Molar volume of methane

L/mol

22.4

Gas state constant

J/mol·K

8.413510

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