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Considering only those who marked "black" and no other race in combination, as in the first table, the percentage was 12.4% in 2020, down from 12.6% in 2010. Considering those who marked "black" and any other race in combination, as in the second table, the percentage increased from 13.6% to 14.2%.
Oxy-acetylene torches can easily cut through ferrous materials in excess of 200 mm (7.9 in). Oxygen lances are used in scrapping operations and cut sections thicker than 200 mm. Cut-off grinders are useless for these kinds of application. Robotic oxy-fuel cutters sometimes use a high-speed divergent nozzle.
The states and territories included in the United States Census Bureau 's statistics for the United States population, ethnicity, and most other categories include the 50 states and Washington, D.C. Separate statistics are maintained for the five permanently inhabited territories of the United States: Puerto Rico, Guam, the U.S. Virgin Islands ...
A magnetohydrodynamic generator ( MHD generator) is a magnetohydrodynamic converter that transforms thermal energy and kinetic energy directly into electricity. An MHD generator, like a conventional generator, relies on moving a conductor through a magnetic field to generate electric current. The MHD generator uses hot conductive ionized gas (a ...
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay), and stabilizers. [1] It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht, Northern Germany, and was patented in 1867. It rapidly gained wide-scale use as a more robust alternative to the traditional black powder explosives.
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
This list of U.S. cities by black population covers all incorporated cities and Census-designated places with a population over 100,000 and a proportion of black residents over 30% in the 50 U.S. states, the District of Columbia, and the territory of Puerto Rico and the population in each city that is black or African American.
The first major land-based desalination plant may have been installed under emergency conditions on an island off the coast of Tunisia in 1560. [ 13 ] [ 14 ] It is believed that a garrison of 700 Spanish soldiers was besieged by the Turkish army and that, during the siege, the captain in charge fabricated a still capable of producing 40 barrels ...