The pH of water determines the solubility (amount that can be dissolved in the water) and biological availability (amount that can be utilized by aquatic life) of chemical constituents such as nutrients (phosphorus, nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc.).
A huge Oa... A Major League Baseball team has 25 players on its active roster. Exactly how many of these are pitchers, and how many are position players, is up to the manager of each team and not dictated by rule. However, it is common for there to be 12 pitchers and 13 position players.
In baseball, more than any other sport, numbers matter. Here: 56, .400, 3,000. If you're a serious student of the game, you know what those mean, instinctively, without context or clarification. Now, with MLB's collective bargaining agreement set to expire after the 2016 season, another number is getting attention: 162. For more than 50 years, that's how many games have been crammed into the regular-season schedule. It's a grind, a marathon, a spring-to-autumn endurance test.