Surface excess amount

{
  "id": "MLC-T-CHM-011640",
  "term": "Surface excess amount",
  "field": "Chemistry",
  "definition": "The excess of the amount of a component actually present in an interfacial system over the amount in a reference system of equal volume, in which the bulk concentrations stay uniform up to a Gibbs dividing surface. It can be positive or negative and depends on where the dividing surface is placed. It is an amount of substance in moles, and dividing by the interfacial area gives the surface excess concentration Γ in mol per square metre.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1816 (https://doi.org/10.1515/pac-2019-0404)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/surface-excess-amount/"
}