# pH

> measure of the acidity of an aqueous solution

**Wikidata**: [Q40936](https://www.wikidata.org/wiki/Q40936)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/PH)  
**Source**: https://4ort.xyz/entity/ph


## References

1. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
2. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=32910)
3. Freebase Data Dumps. 2013
4. Nuovo soggettario
5. BBC Things
6. YSO-Wikidata mapping project
7. Quora
8. National Library of Israel