@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix constant: <http://qudt.org/vocab/constant/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix qkdv: <http://qudt.org/vocab/dimensionvector/> .
@prefix quantitykind: <http://qudt.org/vocab/quantitykind/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix si-quantity: <https://si-digital-framework.org/quantities/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix vaem: <http://www.linkedmodel.org/schema/vaem#> .
@prefix voag: <http://voag.linkedmodel.org/schema/voag#> .

quantitykind:Reflectivity
  a qudt:QuantityKind ;
  dcterms:description """<p>For homogeneous and semi-infinite materials, reflectivity is the same as reflectance. Reflectivity is
    the square of the magnitude of the Fresnel reflection coefficient, which is the ratio of the reflected to incident electric
    field;&nbsp;as such the reflection coefficient can be expressed as a complex number as determined by the Fresnel equations for
    a single layer, whereas the reflectance is always a positive real number.</p>  <p>For layered and finite media, according to
    the CIE,&nbsp;<em>reflectivity</em> is distinguished from <em>reflectance</em> by the fact that reflectivity is a value that
    applies to <em>thick</em> reflecting objects.<span style="font-size:10.8333px"> </span>When reflection occurs from thin layers
    of material, internal reflection effects can cause the reflectance to vary with surface thickness. Reflectivity is the limit
    value of reflectance as the sample becomes thick; it is the intrinsic reflectance of the surface, hence irrespective of other
    parameters such as the reflectance of the rear surface. Another way to interpret this is that the reflectance is the fraction
    of electromagnetic power reflected from a specific sample, while reflectivity is a property of the material itself, which
    would be measured on a perfect machine if the material filled half of all space.</p>
  """^^rdf:HTML ;
  qudt:applicableUnit unit:FRACTION ;
  qudt:applicableUnit unit:PERCENT ;
  qudt:applicableUnit unit:UNITLESS ;
  qudt:hasDimensionVector qkdv:A0E0L0I0M0H0T0D1 ;
  qudt:informativeReference "https://en.wikipedia.org/wiki/Reflectivity"^^xsd:anyURI ;
  qudt:latexSymbol "$\\rho$"^^qudt:LatexString ;
  qudt:plainTextDescription """For homogeneous and semi-infinite materials, reflectivity is the same as reflectance. Reflectivity
    is the square of the magnitude of the Fresnel reflection coefficient, which is the ratio of the reflected to incident electric
    field; as such the reflection coefficient can be expressed as a complex number as determined by the Fresnel equations for a
    single layer, whereas the reflectance is always a positive real number.  For layered and finite media, according to the
    CIE, reflectivity is distinguished from reflectance by the fact that reflectivity is a value that applies to thick reflecting
    objects. When reflection occurs from thin layers of material, internal reflection effects can cause the reflectance to vary
    with surface thickness. Reflectivity is the limit value of reflectance as the sample becomes thick; it is the intrinsic
    reflectance of the surface, hence irrespective of other parameters such as the reflectance of the rear surface. Another way to
    interpret this is that the reflectance is the fraction of electromagnetic power reflected from a specific sample, while
    reflectivity is a property of the material itself, which would be measured on a perfect machine if the material filled half of
    all space.
  """ ;
  qudt:specializationOf quantitykind:Reflectance ;
  rdfs:comment "Applicable units are those of quantitykind:Reflectance" ;
  rdfs:isDefinedBy <http://qudt.org/3.4.0/vocab/quantitykind> ;
  rdfs:label "Reflectivity"@en ;
  skos:broader quantitykind:Reflectance .