<Dl> <Dd> 2 H O → H O + OH </Dd> </Dl> <Dd> 2 H O → H O + OH </Dd> <P> depends on the activation energy, ΔE . According to the Boltzmann distribution the proportion of water molecules that have sufficient energy, due to thermal population, is given by </P> <Dl> <Dd> N N 0 = e − Δ E ‡ k T (\ displaystyle (\ frac (N) (N_ (0))) = e ^ (- (\ frac (\ Delta E ^ (\ ddagger)) (kT)))) </Dd> </Dl>

The term that summarizes physical chemical and biological characteristics of a body of water is