PH scale — Science definition
Defined in 2 courses:
- A logarithmic measure related to hydrogen-ion activity in water. Common dilute solutions near room temperature lie roughly within 0–14 with neutral near 7; this is not a universal range. (Physical Science: Matter, Forces & Energy)
- A scale from 0 to 14 that measures how acidic or basic a solution is; below 7 is acidic, exactly 7 is neutral, and above 7 is basic. (Physical Science: Chemistry)
Where it is taught
- Acids, Bases & pH — Chemistry, Physical Science: Matter, Forces & Energy, Grade 8
- pH & Neutralization — Acids, Bases & Titration, Physical Science: Chemistry, Grade 11