@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:t7-3.2>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-3.2" ;
  skosxl:prefLabel "spectral radiant energy density in terms of wavelength"@en ;
  skosxl:altLabel "w_lambda"@en ;
  skos:definition "change of radiant energy density with wavelength, expressed by\n\n[stem%unnumbered]\n++++\nw_lambda = (\"d\"w)/(\"d\"lambda)\n++++\n\nwhere stem:[w] is radiant energy density (<<t7-3.1>>) as a function of wavelength stem:[lambda] (<<iso80000-3>>)\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-7> ;
  isq:hasUnit [
    skos:notation "J/(m^3*nm)" ;
    skosxl:prefLabel "joule per cubic metre nanometre"@en
  ] ;
  isq:hasUnit [
    skos:notation "kg*m^(-2)*s^(-2)" ;
    skosxl:prefLabel "kilogram per square metre second squared"@en
  ] ;
  skos:note "Spectral radiant energy density within a Planckian radiator is given by stem:[w_lambda = 8 pi h c_0 * f(lambda, T)], where stem:[h] is the Planck constant (<<iso80000-1>>), stem:[c_0] is speed of light in vacuum (<<iso80000-1>>), stem:[T] is thermodynamic temperature (<<iso80000-5>) and\n\n[stem%unnumbered]\n++++\nf(lambda,T) = (lambda^(-5))/(\"exp\"(c_2 lambda^(-1)T^(-1))-1)\n++++\n\nFor the radiation constant stem:[c_2] in stem:[f(lambda, T)], see <<iso80000-1>>.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-3.2> .