@prefix isq: <https://w3id.org/standards/isq/ontologies/core/> .
@prefix smart: <https://example.org/smart-sdu/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<isq:t7-35.2>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-35.2" ;
  skosxl:prefLabel "linear absorption coefficient <radiometry>"@en ;
  skosxl:altLabel "alpha_\"l\""@en ;
  skosxl:altLabel "a_\"l\""@en ;
  skosxl:altLabel "alpha"@en ;
  skos:definition "relative decrease in radiant flux (<<t7-4.1>>) caused by absorption"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-7> ;
  isq:hasUnit [
    skos:notation "m^(-1)" ;
    skosxl:prefLabel "per metre"@en
  ] ;
  skos:note "This quantity is also defined spectrally in terms of wavelength, in which case, \"spectral\" is added before this quantity name.\n\nThe spectral linear absorption coefficient can be expressed by the relative decrease in the spectral radiant flux, stem:[Phi_(\"e\",lambda)(lambda)], with respect to propagation length, stem:[l], of a collimated beam at a point in an absorbing medium\n\n[stem%unnumbered]\n++++\nalpha_\"l\"(lambda) = 1/(Phi_(\"e\",lambda)(lambda)) (\"d\"Phi_(\"e\",lambda)(lambda))/(\"d\"l)\n++++\n\nIt can also be expressed as a function of transmittance (<<t7-31.5>>).\n\n[stem%unnumbered]\n++++\nalpha_\"l\" = -\"ln\"(tau)//l = A_\"n\"//l\n++++\n\nThe linear absorption coefficient is that part of the linear attenuation coefficient (<<t7-35.1>>) that is due to absorption. Scattering might also contribute.\n\nSimilarly, luminous and photon quantities can be defined.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-35.2> .