About: http://webisa.webdatacommons.org/69867985

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	First, calibration must be made before each measurement to correct for sound propagation delays or changes due to the various layers of gas between the transducer and the oil and other environmental conditions.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com