Quantum

{
  "id": "MLC-T-CHM-009758",
  "term": "Quantum",
  "field": "Chemistry",
  "definition": "The smallest discrete amount of a physical quantity that a system can exchange, especially the photon, which is the quantum of electromagnetic radiation. A photon carries energy equal to Planck's constant times the radiation frequency, E = hν, and one mole of photons is called an einstein. Energies of bound systems and angular momentum are quantized, whereas the energy of a free particle varies continuously.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "photon"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2267 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/quantum/"
}