Google Doodle honours SPL Sorensen who introduced pH scale
New Delhi, May 29 : Google on Tuesday celebrated Danish chemist Soren Peder Lauritz Sorensen who introduced the pH scale to the world with an interactive Doodle.
Sorensen's method of expressing acidity -- the negative logarithm of hydrogen ion concentration (pH) -- still has a wide range of real-world uses.
For example, in agriculture, the pH value can indicate the moisture associated with a soil, which can reveal what crops are suitable for the soil and what adjustments farmers must make to adapt it for growing any other crops.
Born in Havrebjerg in 1868, Sorensen was initially interested in studying medicine at University of Copenhagen. But he eventually spent more time studying chemistry and obtained his PhD in 1899.
Sorensen did most of his research in Carlsberg Laboratories. He became the director of its chemical section in 1901. While at Carlsberg, Sorensen started to study amino acids, proteins and enzymes.
As hydrogen ion concentration played a key role in enzymatic reactions he devised a simple way of expressing it, according to EuCheMS, the European Association for Chemical and Molecular Sciences.
He found that by taking a negative logarithm of hydrogen ion concentration a convenient scale can be established. This is the well-known pH value.
He also developed buffer solutions to maintain constant pH of solutions (Sorensen buffers), EuCheMS noted in a short biography of the scientist in its website.
The Google Doodle on Tuesday allows users to see for themselves the pH value of different food items, including tomatoes and eggs in a scale of 1 to 14.
Sorensen retired from his post at Carlsberg in 1938. He died in Copenhagen in 1939.
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India cricketer Rinku Singh receives underworld threat: Mumbai Crime Branch confirms
Mumbai: Indian cricketer and 2025 Asia Cup champion Rinku Singh has reportedly received a threat from the underworld, according to the Mumbai Crime Branch. The investigation has revealed that Dawood Ibrahim-led D-Company sent multiple ransom demands earlier this year.
Authorities confirmed that between February and April 2025, Rinku’s promotional team received three extortion messages demanding ₹5 crore. Acting on the leads, police arrested two suspects, Mohammed Dilshad and Mohammed Naveed, from the Caribbean. The duo was extradited and handed over to Indian authorities on August 1.
Investigators further discovered that the accused had also demanded ₹10 crore from Zeeshan Siddiqui, son of the late former MLA Baba Siddiqui. During interrogation, one of the arrested suspects reportedly admitted to contacting Rinku Singh’s team for ransom.
Rinku, who hails from Aligarh, Uttar Pradesh, rose to national prominence after his five consecutive sixes in an IPL 2023 match against Gujarat Titans. He made his India debut in 2024 and played a decisive role in the 2025 Asia Cup final against Pakistan, hitting the winning runs that secured India’s ninth title.
The left-handed batter, currently representing Kolkata Knight Riders (KKR), has played 54 T20Is for India, amassing 550 runs at a strike rate of 161.77. In the IPL, he has appeared in 58 matches, scoring 1,099 runs, and was part of KKR’s 2024 title-winning squad.
Recently engaged to MP Priya Saroj, Rinku is expected to feature in India’s upcoming white-ball tour of Australia, which includes five T20 Internationals.
Police investigations into the underworld threat are ongoing.
