About: http://webisa.webdatacommons.org/93094025

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Since M2 must be completely opaque, having a light transmitance less than about 0.1% at 550 nm, it generally must have a thickness of greater than 30 nm, especially if it is composed of aluminum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es