| Gf | Free gas (SCF/ton) |
| Ga | Adsorbed gas (SCF/ton) |
| GSL | Maximum adsorbed gas (SCF/ton) |
| Gm | Maximum adsorbed gas (SCF/ton) |
| Gp | Produced gas (SCF) |
| Sw | Water saturation |
| Sg | Gas saturation |
| μ | Gas viscosity (cP) |
| M | Molecular weight (g/mol) |
| R | Gas constant (8.314 J/mol·K) |
| T | Temperature (R or K) |
| P | Pressure (psi or Pa) |
| PL | Langmuir pressure (psi or Pa) |
| PS | Saturation pressure (psi or Pa) |
| kb | BET adsorption constant |
| kf | Freundlich adsorption constant |
| ρc | Density of coalbed methane (g/cm3) |
| Z* | Modified compressibility factor |
| CME | Molar adsorption capacity (lbm.mol/ft3) |
| Cg | Gas compressibility coefficient (1/psi) |
| VSL | Maximum sorption capacity (ft3 or cm3) |
| ρs | Sorbed phase density (g/cm3) |
| ρb | Bulk density (g/cm3) |
| ρma | Matrix density (g/cm3) |
| ρgas | Gas density (g/cm3) |
| Bg | Formation volume factor (ft3/SCF) |
| Vb | Bulk volume (ft3) |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.