@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:t12-30>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "12-30" ;
  skosxl:prefLabel "effective mass"@en ;
  skosxl:altLabel "m**"@en ;
  skos:definition "quantity given by:\n\n[stem%unnumbered]\n++++\nm** = \"P{hbar}\"^2k // (\"d\"epsilon//\"d\"k)\n++++\n\nwhere stem:[k] is wavenumber (<<iso80000-3>>), stem:[epsilon] is the energy (<<iso80000-5>>) of an electron in the interior of a substance, and stem:[\"P{hbar}\"] is the reduced Planck constant (<<iso80000-1>>)\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-12> ;
  isq:hasUnit [
    skos:notation "kg" ;
    skosxl:prefLabel "kilogram"@en
  ] ;
  skos:note "When stem:[k] refers to a state where stem:[epsilon] has an extremum, stem:[m** = \"P{hbar}\"^2 // (\"d\"^2 epsilon // \"d\"k^2)]. The effective mass can be generalized to refer to an anisotropic system with stem:[epsilon=epsilon(bb(ii(k)))]."@en ;
  iso:urn <urn:iso:std:iso:80000:-12:ed-2:en:item:12-30> .