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v. t. e. The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
COVID-19 is the deadliest pandemic in US history; [359] it was the third-leading cause of death in the US in 2020, behind heart disease and cancer. [360] From 2019 to 2020, US life expectancy dropped by 3 years for Hispanic Americans, 2.9 years for African Americans, and 1.2 years for white Americans. [361]
A superhydrophobic coating is a thin surface layer that repels water. It is made from superhydrophobic ( ultrahydrophobicity) materials, and typically cause an almost imperceptibly thin layer of air to form on top of a surface. Droplets hitting this kind of coating can fully rebound. [1] [2] Generally speaking, superhydrophobic coatings are ...
Eureka Vacuum Cleaner Company was founded in 1909 in Detroit, Mich. by Toronto, Canada-born real estate auctioneer Fred Wardell (1866–1952) to sell vacuum cleaners for which he had acquired several patents. At first only selling vacuum cleaners manufactured by others, in 1913 he and four partners purchased their first plant.
C4-FN. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). C4-FN ( C4-fluoronitrile, C4FN) is a perfluorinated compound developed as a high- dielectric gas for high-voltage switchgear. [1] It has the structure (CF 3) 2 CFC≡N, which can be described as perfluoro isobutyronitrile ...
DTW-125. Second-generation Chinese sabot round introduced in 1999. Initially 125-IIM acted as the export version with reduced velocity but with the introduction of DTC10-125, the DTW-125 itself became exported under the name “BTA4”. Country of origin: China. Projectile dimension: 642 mm. Round weight: 21.36 kg.
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