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The critical point is 304.128(15) K (30.978(15) °C) at 7.3773(30) MPa (72.808(30) atm). Another form of solid carbon dioxide observed at high pressure is an amorphous glass-like solid. [28] This form of glass, called carbonia , is produced by supercooling heated CO 2 at extreme pressures (40–48 GPa , or about 400,000 atmospheres) in a ...
25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia pestis and spread by ...
The first United States census in 1790 classed residents as free White people (divided by age and sex), all other free persons (reported by sex and color), and enslaved people. The 2000 census officially recognized six racial categories including people of two or more races; a category called "some other race" was also used in the census and ...
Louisiana. Louisiana [pronunciation 1] (French: Louisiane [lwizjan] ⓘ; Spanish: Luisiana [lwiˈsjana]; Louisiana Creole: Lwizyàn) [b] is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east.
Infobox references. Sulfuric acid ( American spelling and the preferred IUPAC name) or sulphuric acid ( Commonwealth spelling ), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, and hydrogen, with the molecular formula H2SO4. It is a colorless, odorless, and viscous liquid that is miscible with water.
Ozone ( / ˈoʊzoʊn /) (or trioxygen) is an inorganic molecule with the chemical formula O. 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O. 2, breaking down in the lower atmosphere to O.
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