A primer on pH. it also has a lower pH "A primer on pH" pH is a logarithmic scale https://www.pmel.noaa.gov/co2/story/A+primer+on+pH 30 percent increase in acidity NOAA primer on pH Learn more at NOAA. http://www.pmel.noaa.gov/co2/story/A+primer+on+pH A primer on pH Ph (acidity) scale is logarithmic http://www.pmel.noaa.gov/co2/story/A+primer+on+pH A primer on pH. NOAA 30 percent increase pH scale and percentage change in acidity http://www.pmel.noaa.gov/co2/story/A+primer+on+pH NOAA A primer on pH – Pacific Marine Environmental Laboratory A primer on pH it also has a lower pH Learn more at NOAA. http://www.pmel.noaa.gov/co2/story/A+primer+on+pH