About: http://webisa.webdatacommons.org/81842322

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	In accordance with standard practice, the cavity 32 is filled with a liquid, such as water or glycerin, which acts as a couplant of the beams of ultrasonic vibrations to the workpiece 42.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com