Field level

{
  "id": "MLC-T-CHM-004411",
  "term": "Field level",
  "field": "Chemistry",
  "definition": "A logarithmic measure of a field quantity, such as electric field strength or sound pressure, expressed relative to a reference value. The field level, L_F, is calculated as ln(F/F_0), where F is the field quantity and F_0 is the reference value. This quantity is dimensionless, but it is given the unit neper (Np) to indicate its logarithmic nature.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "decibel",
    "neper"
  ],
  "references": [
    "Green Book, 2nd ed., p. 79 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/field-level/"
}