<http://webisa.webdatacommons.org/prov/472276704>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/19826180> .
<http://webisa.webdatacommons.org/19826180>	<http://www.w3.org/ns/prov#value>	"where n is a constant for any two materials and a given colour of light." .
<http://webisa.webdatacommons.org/19826180>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/19826180>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<mashpedia.com> .