Jisho

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Noun
1. activity
Wikipedia definition
2. Activity (chemistry)In chemical thermodynamics, activity (symbol a) is a measure of the “effective concentration” of a species in a mixture, meaning that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution. By convention, activity is treated as a dimensionless quantity, although its actual value depends on customary choices of standard state for the species.
Read “Activity (chemistry)” on English Wikipedia
Read “活量” on Japanese Wikipedia
Read “Activity (chemistry)” on DBpedia

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