About: http://webisa.webdatacommons.org/56156519

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	pH is a measure of the acidity or alkalinity of a substance. pH meters will typically measure the pH of a liquid, but with a specialised probe they can also measure surfaces, and in semi-solids such as cheese and soil.
http://www.w3.org/ns/prov#wasQuotedFrom	instrumentchoice.com.au