Sörensen, Sören Peter Lauritz [key], 1868–1939, Danish biochemist. In 1899 he received a Ph.D. degree in Copenhagen. Sörensen was director of chemistry at Carlsberg Laboratory and worked as a professor in Copenhagen. His work on hydrogen ion concentration led him to suggest that it be measured in a unit he called pH. Numerical values based on this unit, now universally in use, give an indication of the acidity of solutions. He also did pioneering research on amino acid synthesis and on the nature of enzyme reactions.
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