He devised the pH scale Sørensen’s most notable achievement was his introduction of the pH scale, which is used to this day to describe the acidity or alkalinity of a substance or solution.

Sørensen was the first to create a pH scale that was easy for chemists to use to classify acidity and basicity.

How well do you remember the pH scale from chemistry class? Today’s Google Doodle presents a small interactive to jog your memory, and more importantly, celebrate Søren Peder Lauritz Sørensen ...

Which sounds strange, doesn’t it? But the more acidic a soap, the lower it falls on the pH scale. So when Sebamed’s ad puts a bar of Rin detergent at pH 10, it is telling us that Rin is not ...