Phenomenological equation

{
  "id": "MLC-T-CHM-008757",
  "term": "Phenomenological equation",
  "field": "Chemistry",
  "definition": "A macroscopic equation that describes the relationship between fluxes and forces in a system, without detailing the microscopic mechanisms. These equations are derived from experimental observations and thermodynamic principles, often involving proportionality constants known as phenomenological coefficients. An example is Fick's law of diffusion, which relates mass flux to a concentration gradient.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "electrochemical potential",
    "gradient",
    "isotropic",
    "linear range"
  ],
  "references": [
    "PAC, 1981, 53, 1827. 'Nomenclature for transport phenomena in electrolytic systems' on page 1830 (https://doi.org/10.1351/pac198153101827)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/phenomenological-equation/"
}