About: http://webisa.webdatacommons.org/407335852

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	The absolute amount of one of the gases in air can be detected by many types of indicators and sensors, e.g. electrochemical sensors, conductive polymers, thick film technology sensors, or thin film technology sensors.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com