path-length

symbols: $l$, $s$, units: $\pu{m}$, $\pu{\upmu\!m}$, $\pu{mm}$, $\pu{cm}$
synonym: path length
https://doi.org/10.1351/goldbook.08278
Length of the optical path through the sample.
Notes:
  1. In a transmission cell the path-length is usually taken as the distance between the windows.
  2. SI unit: \(\pu{m}\). Commonly used units: \(\pu{\upmu\!m}\), \(\pu{mm}\).
See also: optical path difference
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 669 (https://doi.org/10.1515/pac-2019-0203)