Brønsted acid, 189 Brønsted base, 189 Brønsted relation, 189 bubble column, 190 bubbler in atmospheric chemistry, 190 buffer-addition technique in analytical flame spectroscopy , 190 bulk concentration in electroanalysis , 190 bulk mesophase, 191 bulk rheology, 191 bulk sample, 191 Bunnett–Olsen equations, 191