Since the activity coefficient is only valid at low concentrations, the function being used is close to or moving towards the reference system. Therefore, the activity coefficient is going towards 1 and is usually put in the equation that way. So

• Since the activity coefficient is only valid at low concentrations, the function being used is close to or moving towards the reference system. Therefore, the activity coefficient is going towards 1 and is usually put in the equation that way. So

• a = g(t)

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