@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:t11-4.39>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "11-4.39" ;
  skosxl:prefLabel "Sommerfeld number"@en ;
  skosxl:altLabel "So"@en ;
  skosxl:altLabel "Sm"@en ;
  skos:definition "relation between viscous force and load force in a lubrication boundary, expressed by\n\nstem:[So = (eta n)/p (r/c)^2]; where\n\nstem:[eta]:: is dynamic viscosity (<<iso80000-4>>) of the lubricant,\nstem:[n]:: is rotational frequency (<<iso80000-3>>),\nstem:[p]:: is mean bearing pressure (<<iso80000-4>>),\nstem:[r]:: is radius (<<iso80000-3>>) of the shaft, and\nstem:[c]:: is radial distance (<<iso80000-3>>) between rotating shaft and annulus\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-11> ;
  skos:note "Sometimes the inverse of this number is wrongly used."@en ;
  iso:urn <urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.39> .