Google Doodle: Danish Biochemist Honoured For Creating The pH Scale

Google today honours Danish biochemist Soren Peder Lauritz Sorensen for his revolutionary work in introducing to the scientific community, the concept of the pH scale. The pH scale is a concept that is used to measure acidity and alkalinity of substances. The term pH is widely used in chemistry and biology. The significance of pH is that it measures the concentration of the hydrogen ion and ‘ranks’ them on a scale of numbers between 0 and 14. The ‘rank’ of the substance is known as the pH level of the substance being measured.
Substances which have a pH level of less than 7 are acidic, whereas the solutions with a pH value higher than 7 are alkalis or are basic. Water has a pH level of 7, which is neutral. Hence water is neither acidic, nor is it a base.