pH scale
A scale of 0–14 measuring the acidity or alkalinity of a substance. A pH of 7 is neutral; below 7 is acidic; above 7 is alkaline (basic). Archival papers are pH neutral or slightly alkaline (buffered).
A scale of 0–14 measuring the acidity or alkalinity of a substance. A pH of 7 is neutral; below 7 is acidic; above 7 is alkaline (basic). Archival papers are pH neutral or slightly alkaline (buffered).