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18-Crown-6 is an organic compound with the formula [C 2 H 4 O] 6 and the IUPAC name of 1,4,7,10,13,16-hexaoxacyclooctadecane. It is a white, hygroscopic crystalline solid with a low melting point. [ 1] Like other crown ethers, 18-crown-6 functions as a ligand for some metal cations with a particular affinity for potassium cations ( binding ...
3LR12 (4.5-volt), D, C, AA, AAA, AAAA (1.5-volt), A23 (12-volt), PP3 (9-volt), CR2032 (3-volt), and LR44 (1.5-volt) batteries. This is a list of the sizes, shapes, and general characteristics of some common primary and secondary battery types in household, automotive and light industrial use. The complete nomenclature for a battery specifies ...
Battery numbering. IEC 60086 battery type designation system. Examples of the IEC nomenclature are batteries coded R20, 4R25X, 4LR25-2, 6F22, 6P222/162, CR17345 and LR2616J. The letters and numbers in the code indicate the number of cells, cell chemistry, shape, dimensions, the number of parallel paths in the assembled battery and any modifying ...
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Kilby and two other colleagues created the Cal-Tech, a three-pound battery-powered calculator that could do basic math and fit six-digit numbers on its display. This 4.25 x 6.15 x 1.75 inch calculator's processor would originate the vast majority of Texas Instruments’ revenue. [20]
Crown ether. In organic chemistry, crown ethers are cyclic chemical compounds that consist of a ring containing several ether groups ( R−O−R’ ). The most common crown ethers are cyclic oligomers of ethylene oxide, the repeating unit being ethyleneoxy, i.e., −CH2CH2O−. Important members of this series are the tetramer ( n = 4), the ...
The US Department of Transportation has laid out a plan to deploy vehicle-to-everything tech across the country. The aim is to reduce the number of deaths and serious injuries on America's roadways.
The HP calculators Voyager series consisted of five models, some of which were manufactured in several variants (with years of production): HP-10C – basic scientific calculator (1982–1984). HP-11C – mid-range scientific calculator (1981–1989). HP-12C – business/financial calculator (1981–present). HP-15C – advanced scientific ...