Update h_water_quality.rst

source/h_water_quality.rst

@@ -57,7 +57,7 @@ Half-life and decay rate
 
 Substance property databases often define the half-life of substances in water. The concept of half-life is related to constant decay rate and can be converted to it by a simple formula.
 
-Figure :numref:`fig:decay_term` shows the results for various decay rate constants (:math:`\mu \, [s^{-1}]`). The dotted lines indicate the half-life period (:math:`t_{1/2}`) for :math:`\mu = 0.001 \, s^{-1}`. This is the time it takes to reduce the amount of substance to half. To convert the half-life to a decay coefficient, the following equation can be used:
+Figure :numref:`fig:decay_term` shows the results for various decay rate constants (:math:`\mu \, [s^{-1}]`). The dotted lines indicate the half-life period (:math:`t_{1/2}`) for :math:`\mu = 0.001 \, s^{-1}`. This is the time it takes to reduce the amount of substance to half. To determine a decay rate constant based on the half-life period, one can use:
 
 .. math::