The pH scale . The pH scale shows how acidic a substance is. Learn what pH means and how it is measured in this KS3 chemistry guide from BBC Bitesize.

What is the pH scale? The pH scale shows how acidic a substance is. Learn what pH means and how the pH scale s measured in this KS3 chemistry guide.

In chemistry, pH is a measurement of the concentration of hydrogen ions in a water-based solution. A lower pH means that there are more hydrogen ions in the liquid, whereas a higher pH indicates ...