@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:t8-9>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "8-9" ;
  skosxl:prefLabel "sound power"@en ;
  skosxl:altLabel "P"@en ;
  skosxl:altLabel "W"@en ;
  skos:definition "integral over a surface of the product of sound pressure, stem:[p] (<<t8-2.2>>), and the component stem:[u_\"n\"] of the particle velocity (<<t8-4>>) in the direction normal to the surface, at a point on the surface"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-8> ;
  isq:hasUnit [
    skos:notation "W" ;
    skosxl:prefLabel "watt"@en
  ] ;
  isq:hasUnit [
    skos:notation "kg*m^2*s^(-3)" ;
    skosxl:prefLabel "kilogram square metre per second cubed"@en
  ] ;
  skos:note "This definition holds for waves in the volume of homogenous fluids or gases.\n\nThis definition can become inapplicable in situations with a high mean fluid flow.\n\nSound power is for example used to indicate the rate at which energy is radiated by a sound source.\n\nSound power is an oscillatory quantity that can be positive or negative. A positive sound power indicates that the sound power is radiated out of the surface. A negative sound power indicates that the sound power is absorbed into the surface.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-8:ed-1:en:item:8-9> .