Answer:
S '(T) is the rate at which oxygen solubility changes with respect to the water temperature.
Step-by-step explanation:
Solubility (S) is the maximum amount of a solute that may be dissolved in a fixed mass of solvent. It usually depends on temperature (T), which we can express as S = S(T). Thus, the derivative S '(T) is the rate at which oxygen (solute) solubility changes with respect to the water (solvent) temperature.