In chemical kinetics, the overall rate of a reaction is often approximately determined by the slowest step, known as the rate determining step or rate-limiting step. For a given reaction mechanism, the prediction of the corresponding rate equation is often simplified by using this approximation of the rate determining step. In principle, the time evolution of the reactant and product concentrations can be determined from the set of simultaneous rate equations for the individual steps of the mech
Since the Department of Buildings was created in 1865, any year in the decades of the 00s, 10s, 20s, 30s, 40s, or 50s you can assume is from the 1900s. Likewise, the Department of Buildings stopped using this system about 1990, so any permit with a 90âs year is probably from 1890s.
Conceived in 1884, construction of the tower began in 1887 and involved some 50 engineers, 100 iron workers, and 121 construction workers. It was completed on March 31, 1889, at a cost of 7,800,000 French gold francs. The main structure of the tower is composed of wrought-iron, coated (at present) with bronze paint. It is 324 metres (1,063 ft) in height, weighs a total of 10,000 tonnes (73 percent wrought-iron), and for 41 years it remained the tallest man-made structure in the world, until superceded by New York's Chrysler Building, designed by William van Alen (1883-1954), in 1930.