Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Hydrogen ion concentration (p H)-en#Sense
Wasserstoffionen-Konzentration (p H)-de#Sense
Συγκέντρωση ιόντων υδρογόνου (p H)-el#Sense
Concentration en ions hydrogène (p H)-fr#Sense
Concentrazione di ioni idrogeno (p H)-it#Sense
Vetyionipitoisuus-fi#Sense