s for the                            liquid and gas phases considering the                            gas-to-liquid density ratio.</li><li><b>compressibilityCoeffs</b>: Computes the compressibility coefficients for                            the liquid and gas phases based on the liquid                            saturation degree Sl, liquid pressure pl,                            and gas pressure pg.</li><li><b>compressibilityCoeffsPgPc</b>: Computes the compressibility coefficients                        