@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:t8-13>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "8-13" ;
  skosxl:prefLabel "acoustic impedance"@en ;
  skosxl:altLabel "Z_\"a\""@en ;
  skos:definition "at a surface, quotient of the average sound pressure (<<t8-2.2>>) over that surface and the sound volume flow rate (<<t8-6>>) through that surface"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-8> ;
  isq:hasUnit [
    skos:notation "Pa*s/m^3" ;
    skosxl:prefLabel "pascal second per cubic metre"@en
  ] ;
  isq:hasUnit [
    skos:notation "kg*m^(-4)*s^(-1)" ;
    skosxl:prefLabel "kilogram per metre to the fourth second"@en
  ] ;
  skos:note "This definition applies to a sound pressure that is in phase with the volume flow rate. In this situation, the acoustic impedance is real.\n\nBoth the sound pressure, stem:[p], and sound volume flow rate, stem:[q], are real quantities that fluctuate with time. If the fluctuations are in phase (phase difference equal to zero), the quotient stem:[p//q] is a constant. If they are out of phase (phase difference not equal to zero), they can be represented by complex quantities in the frequency domain, the quotient of which is also complex.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-8:ed-1:en:item:8-13> .