Number concentration

{
  "id": "MLC-T-CHM-008156",
  "term": "Number concentration",
  "field": "Chemistry",
  "definition": "The number of specified entities of a constituent divided by the volume of the mixture. This quantity, also known as number density, expresses how many individual particles (such as molecules, atoms, or ions) are present per unit volume. The coherent SI unit for number concentration is reciprocal cubic metres (m⁻³), although other units like cm⁻³ are also used.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "number of entities",
    "concentration",
    "constituent"
  ],
  "references": [
    "Green Book, 2nd ed., p. 39 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)",
    "PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 984 (https://doi.org/10.1351/pac199668040957)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/number-concentration/"
}