Søren Peder Lauritz Sørensen, born in Havrebjerg, Denmark on January 9, 1868 and died on February 12, 1939, was a Danish chemist. From 1901 he was head of the prestigious Carlsberg Laboratory, Copenhagen. The important chemical concept pH was introduced by S. P. L. Sørensen. A city in Denmark. ... The Kingdom of Denmark is geographically the smallest Nordic country and is part of the European Union. ... January 9 is the 9th day of the year in the Gregorian calendar. ... 1868 was a leap year starting on Wednesday (see link for calendar). ... February 12 is the 43rd day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... The Kingdom of Denmark is geographically the smallest Nordic country and is part of the European Union. ... A chemist is a scientist who specializes in chemistry. ... Carlsberg A/S headquartered in Valby, Denmark, with its operating company, Carlsberg Breweries A/S, headquartered in Copenhagen produce Carlsberg Beer. ... City nickname: none Location in Denmark Area  - Total  - Water 526 km² xxx km² xx% Population  - City ( 2004)  - Metropolitan  - Density 502,204 1,116,979 954/km² [including water] xxx/km² [land only] Time zone Eastern: UTC+1 Latitude Longitude 55°43 N 12°34 W Copenhagen ( Danish: København) is... PH or ph or pH or Ph may be: In chemistry, pH is a measure of acidity. ...