Chemistry term for the measure of acidity or alkalinity. Used in both technical and general contexts.
from German
Please measure the pH of this solution.
Every morning, I measure the pH of the pool water.
A low pH indicates strong acidity.
This soil has a low pH and is strongly acidic.
From German 'pH', an abbreviation of 'Potenz' (power) and 'H' (hydrogen). The katakana reading ペーハー reflects the German pronunciation.