Mass balance of liquid: liquid water and air dissolved in water (H balance) | *P*_{l} | Darcy's law | Pressures/fluxes/meteorological factors |

| | Fick's law | |

| | Henry's law | |

| | Psychrometric law | |

| | Ideal gas law | |

| | Retention curve | |

| | Conductivity functions | |

| | Diffusion/dispersion coefficients | |

Mass balance of gas: water vapour and air (G balance) | *P*_{g} | | |

Internal energy balance (T balance) | *T* | Fourier's law | Temperatures/fluxes |

| * * | Thermal conductivity | |

| * * | Density variation with *T* | |

Momentum balance (M balance) | **u** | Soil constitutive model and corresponding parameters | Displacements/forces |