E/Z photoisomerization, 456 mass spectrum, 456 eclipsed (eclipsing), 456 eclipsing strain, 457 eddy, 457 eddy dispersion (diffusion), 457 educt [obsolete] , 457 effective cadmium cut-off energy in nuclear analytical chemistry , 458 effective charge, 458 effective chimney height (stack height), 458 effective half life, 458 effective molarity (effective concentration), 459 effective theoretical plate number of a chromatographic column , 459 effective thermal cross-section, 459 effectively infinite thickness in flame spectroscopy, 459 effectiveness, 460