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Activity


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Hello,

 

Act2 works in terms of species’ activity, which is technically unitless, but close to the molal concentration. Remember, the activity is equal to the molal concentration of a species times its activity coefficient. When people construct diagrams by hand they typically assume the activity is equal to the concentration, but if you have a fluid of a certain composition in mind you can use SpecE8 to calculate the activity of the main species.
Hope this helps,
Katelyn
Aqueous Solutions LLC
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