@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:t9-24>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "9-24" ;
  skosxl:prefLabel "activity of solute"@en ;
  skosxl:altLabel "relative activity of solute"@en ;
  skosxl:altLabel "a_\"X\""@en ;
  skosxl:altLabel "a_\"m,X\""@en ;
  skos:definition "for a solute stem:[\"X\"] in a solution, quantity proportional to the absolute activity, stem:[lambda_\"X\"] (<<t9-18>>), the proportionality factor, which is a function of temperature (<<iso80000-5>>) and pressure (<<iso80000-4>>) only, being determined by the condition that, at constant temperature and pressure, stem:[a_\"X\"] divided by the molality (<<t9-15>>) ratio, stem:[b_\"X\"//b^(&#8854;)] tends to 1 at infinite dilution; stem:[b_\"X\"] is the molality of solute stem:[\"X\"] (<<t9-15>>), and stem:[b^(&#8854;)] is standard molality:\n\n[stem%unnumbered]\n++++\na_\"X\" = lambda_\"X\" * \"lim\"_(sum b_\"x\" -> 0) (b_\"X\"//b^(&#8854;))/(lambda_\"X\")\n++++\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-9> ;
  isq:hasUnit [
    skos:notation "1" ;
    skosxl:prefLabel "one"@en
  ] ;
  skos:note "The quantity stem:[a_\"c,X\"], similarly defined in terms of the concentration ratio stem:[c_\"X\"//c^(&#8854;)], is also called the activity or relative activity of solute stem:[\"X\"]; stem:[c^(&#8854;)] is a standard amount-of-substance concentration (<<t9-12.2>>):\n\n[stem%unnumbered]\n++++\na_\"c,X\" = lambda_\"X\" \"lim\"_(sum c_\"x\" -> 0) (c_\"x\"//c^(&#8854;))/(lambda_\"X\")\n++++\n\nwhere stem:[sum] denotes summation over all the solute substances. This especially applies to a dilute liquid solution.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-9:ed-2:en:item:9-24> .