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[8] [9] [10] In modern chemistry , the p stands for "the negative decimal logarithm of ", and is used in the term p K a for acid dissociation constants , [ 11 ] so pH is "the negative decimal logarithm of H + ion concentration", while pOH is "the negative decimal logarithm of OH- ion concentration".
The most common scale is now 1 to 7, with 9 being the highest grade obtained. In addition, degrees are awarded in a Class, depending on the grades received. Degrees may be awarded in the First Class, Second Class (Upper Division), Second Class (Lower Division), Third Class, and Pass Class. Grading scales for secondary certificates are standard.
Mole Day originated from a celebration by educator Margaret Christoph. [5] She wrote an article about her experiences in The Science Teacher in the 1980s. [6] Inspired by this article, Maurice Oehler, a high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.
For example, in base-2 scientific notation, the number 1001 b in binary (=9 d) is written as 1.001 b × 2 d 11 b or 1.001 b × 10 b 11 b using binary numbers (or shorter 1.001 × 10 11 if binary context is obvious).
With 42.9 million unique visitors, it was ranked #9, surpassing The New York Times (#10) and Apple (#11). [43] This marked a significant increase over January 2006, when Wikipedia ranked 33rd, with around 18.3 million unique visitors. [44] In 2014, it received 8 billion page views every month.
It is the fourth-largest risk factor overall for human health [7] and in 2018, WHO estimated that "9 out of 10 people breathe air containing high levels of pollutants." [ 8 ] Outdoor particulate pollution ( PM2.5 ) is the largest cause of death (4 million), followed by indoor air pollution (over 2 million) and ozone (0.4 million).
The University of California (UC) is a public land-grant research university system in the U.S. state of California.Headquartered in Oakland, the system is composed of its ten campuses at Berkeley, Davis, Irvine, Los Angeles, Merced, Riverside, San Diego, San Francisco, Santa Barbara, and Santa Cruz, along with numerous research centers and academic centers abroad. [5]
The iPad (9th generation) [3] [4] (also referred to as the iPad 10.2-inch) is a tablet computer developed and marketed by Apple as the successor to the eighth-generation iPad. It was announced on September 14, 2021, and released on September 24.