Example image of eyePlorer eyePlorer map for 'Darcy's law': Constitutive equation Fluid Fluid dynamics Hydrology Phenomenology (science) Porous medium Henry Darcy Sand Water Earth science Permeability (earth sciences) Momentum Navier–Stokes equations Conduction (heat) Electrical network Fick's law of diffusion Molecular diffusion Ohm's law Aquifer Conservation of mass Groundwater flow equation Hydrogeology Viscosity Flux Pressure gradient Porosity Fluid pressure Gravitation Three-dimensional space Density Gradient Gravitational acceleration Unit vector Anisotropy Symmetric matrix Identity matrix Fracture (geology) Fluid statics Groundwater Dam Flownet Reynolds number Particle size Nanosecond Diffusion equation Mathematical singularity Hyperbolic Multiphase flow Relative permeability Membrane operation