<http://webisa.webdatacommons.org/212905278>	<http://www.w3.org/ns/prov#value>	"A medium is a material through which a wave can transfer energy." .
<http://webisa.webdatacommons.org/prov/105208069>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/212905278> .
<http://webisa.webdatacommons.org/212905278>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<yale.edu> .
<http://webisa.webdatacommons.org/212905278>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .