About: http://webisa.webdatacommons.org/47980093

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	is permitted to trickle down over contacting material, such as Raschig rings, sieve trays, or the like, while air is passed countercurrently upwardly past the water.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com