sorption in colloid chemistry , 1404 sorption isotherm in ion exchange, 1405 sorption techniques in trace analysis, 1405 sorptive insertion in surface catalysis , 1405 sp, 1405 space charge in a semiconductor, 1406 space formula, 1406 space time in catalysis , 1406 space velocity in catalysis , 1406 spacer, 1407 spark (source) ionization in mass spectrometry , 1407 spatial-distribution interference in flame spectroscopy, 1407 spatially resolving detector of radiation , 1407 special salt effect, 1408 speciation analysis in chemistry , 1408 speciation in chemistry , 1408 species (taxonomic), 1408 specific, 1408 specific acid–base catalysis, 1409 specific activity, in radiochemistry , 1409 specific adsorption, 1409 specific burn-up, 1409 specific catalysis, 1410specific conductance, 1410 specific detector in chromatography, 1410 specific gravity, 1410 specific heat capacity, , 1410 specific in analysis , 1411 specific ionization in nuclear chemistry , 1411 specific permeability in chromatography , 1411 specific pore volume of a catalyst , 1411 specific retention volume in chromatography , 1411 specific surface area in surface chemistry , 1412 specific volume, , 1412 specific weight, 1412 specifically absorbing ion, 1412 specifically labelled, 1412 specifically labelled tracer, 1413 specimen in analytical chemistry, 1413 spectator mechanism, 1413 spectator-stripping reaction, 1414 spectral bandwidth error in spectrochemical analysis , 1414 spectral distribution, 1414 spectral fluence rate, , 1414 spectral intensity, 1415 spectral interference in flame spectroscopy , 1415 spectral irradiance, , 1415 spectral overlap, 1415 spectral (photon) effectiveness, 1416 spectral photon exitance, , 1416 spectral photon flow, , 1416 spectral photon flux (photon irradiance), , 1417 spectral photon radiance, , 1417 spectral quantities, 1417 spectral radiance, , 1417 spectral radiant energy, , 1418 spectral radiant exitance, , 1418 spectral radiant flux, 1418 spectral radiant intensity, , 1418 spectral radiant power, , 1418 spectral responsivity, 1419 spectral sensitivity, , 1419 spectral sensitization, 1419 spectral spheradiance, 1419 spectrochemical buffer in atomic spectroscopy , 1420spectrochemical carrier in atomic spectroscopy , 1420 spectrogram, 1420 spectrograph, 1420 spectrometer, 1420 spectroscope, 1421 spectroscopy, 1421 spectrum analysis, 1421 specular reflectance (reflection factor), in optical spectroscopy , 1421 speed, , , 1422 speed distribution function, , 1422 speed of light in a vacuum, 1422 spherical carbonaceous mesophase, 1422 spherical radiance, 1422 spherical radiant exposure, 1423 spherulite, 1423 spin conservation rule (Wigner rule), 1423 spin contamination, 1423 spin crossover, 1424 spin density, 1424 spin label, 1424 spin polarization, 1424 spin projection, 1425 spin trapping, 1425 spin-allowed electronic transition, 1425 spin-flip method, 1425 spin-flip transition, 1426 spin-glass transition, 1426 spin-orbit coupling, 1426 spin-orbit coupling constant, , 1426 spin-orbit splitting, 1427 spin-Peierls transition, 1427 spin-state transition, 1427 spin-statistical factor (in diffusion- controlled reactions), 1427 spinodal, 1427 spinodal decomposition, 1428 spin–spin coupling, 1428 spin–spin coupling constant, , 1428 spiro chain in a polymer , 1428 spiro compounds, 1429 spiro macromolecule, 1429 spiro union, 1429 splicing, 1430 spontaneous emission, 1430 spontaneous fission, 1430 spot in chromatography , 1430 sprayer in flame spectroscopy , 1430 spread monolayer, 1431