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:
- In a transmission cell the path-length is usually taken as the distance between the windows.
- SI unit: \(\pu{m}\). Commonly used units: \(\pu{\upmu\!m}\), \(\pu{mm}\).
See also: optical path difference