About: http://webisa.webdatacommons.org/190682033

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	However, a material may be acoustically porous within one frequency range, e.g. low frequencies, whereas the same material may be impermeable for sound within a different frequency range, e.g. high frequencies.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com