A plot of a @[email protected] related to a relevant concentration (activity) as the ordinate vs. some measure of the amount of @[email protected], usually @[email protected] volume (titre) as the abscissa. If the @[email protected] is linearly related to concentrations, such as the electrical @[email protected] or the photometric @[email protected], the term linear @[email protected] curve is used. When a logarithmic expression of the concentration or activity is used, such as the \(\text{pH}\), \(\mathrm{pM}\), or the electrical potential in \(\mathrm{mV}\), the curve is referred to as a logarithmic @[email protected] curve.
Orange Book, 2nd ed., p. 49 [Terms] [Book]