About: http://webisa.webdatacommons.org/390175450

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	Usually, the medium is a gas, often the atmosphere, and the potential difference is a large one, from a few hundred volts to millions of volts.
http://www.w3.org/ns/prov#wasQuotedFrom	csbsju.edu