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The ATP 250 tournaments (previously known as the ATP World Tour 250 tournaments, ATP International Series, and ATP World Series) are the lowest tier of annual men's tennis tournaments on the main ATP Tour, after the four Grand Slam tournaments, ATP Finals, ATP Masters 1000 tournaments, and ATP 500 tournaments.
The 2025 ATP Tour is the global elite men's professional tennis circuit organized by the Association of Tennis Professionals (ATP) for the 2025 tennis season. The 2025 ATP Tour calendar comprises the Grand Slam tournaments, supervised by the International Tennis Federation (ITF), the ATP Finals, the ATP Masters 1000, the United Cup (organized with the WTA), the ATP 500 series and the ATP 250 ...
In chemistry and biochemistry, the Henderson–Hasselbalch equation = + ([] []) relates the pH of a chemical solution of a weak acid to the numerical value of the acid dissociation constant, K a, of acid and the ratio of the concentrations, [] [] of the acid and its conjugate base in an equilibrium.
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Rickey Henderson celebrates his record-breaking 939th stolen base on May 1, 1991, in Oakland. He went on to play 12 more MLB seasons. (AP Photo/Alan Greth) (ASSOCIATED PRESS)
The following is a list of notable players (winners of a main tour title, and/or part of the WTA rankings top 100 in singles, or top 100 in doubles, for at least one week) who announced their retirement from professional tennis, became inactive (after not playing for more than 52 weeks), or were permanently banned from playing, during the 2025 ...
The Charlot equation, named after Gaston Charlot, is used in analytical chemistry to relate the hydrogen ion concentration, and therefore the pH, with the formal analytical concentration of an acid and its conjugate base. It can be used for computing the pH of buffer solutions when the approximations of the Henderson–Hasselbalch equation ...