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In chemistry, pH (/ p iː ˈ eɪ tʃ / pee-AYCH), also referred to as acidity or basicity, historically denotes "potential of hydrogen" (or "power of hydrogen"). [1] It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions.
The refractive index of liquid water (1.333 at 20 °C (68 °F)) is much higher than that of air (1.0), similar to those of alkanes and ethanol, but lower than those of glycerol (1.473), benzene (1.501), carbon disulfide (1.627), and common types of glass (1.4 to 1.6). The refraction index of ice (1.31) is lower than that of liquid water.
Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, [1] 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. [2]
The seventh member of group 18 is oganesson, an unstable synthetic element whose chemistry is still uncertain because only five very short-lived atoms (t 1/2 = 0.69 ms) have ever been synthesized (as of 2020 [3]).
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.
Connecticut State Police (CSP) were dispatched at 9:37 a.m. [89] Newtown police arrived at the school street at 9:39 a.m., approximately three-and-a-half minutes after the 911 call, and Connecticut State Police arrived at the school street at 9:46 a.m. Newtown police first entered the school at 9:45 a.m., approximately nine minutes after the ...
Its North Island is 12.5 km (7.8 mi) long and 1.5 km (0.93 mi) wide, while its South Island is 7 by 4.5 km (4.3 by 2.8 mi). The total area of both islands is 26 km 2 (10 sq mi). According to Statistics Mauritius, at 1 July 2019, the population of Agaléga and St. Brandon was estimated at 274. [118]
The first generation of the high-end and professional flagship iPad Pro was announced on September 9, 2015, and released on November 11, (12.9-inch version) and March 31 (9.7-inch). It used an Apple A9X chip, with a 2× higher memory bandwidth and a 1.8× faster CPU than its predecessor. Its audio system consisted of 4 audio ports and its ...