activity
Pronunciation: ak-tiv′i-tē- electroencephalography The presence of neurogenic electrical energy.
- physical chemistry an ideal concentration for which the law of mass action will apply perfectly; the ratio of the activity to the true concentration is the activity coefficient (γ), which becomes 1.00 at infinite dilution.
- For enzymes, the amount of substrate consumed (or product formed) in a given time under given conditions; turnover number.
- The number of nuclear transformations (disintegrations) in a given quantity of a material per unit time. Units: curie (Ci), millicurie (mCi), becquerel (Bq), megabecquerel (MBq).
See Also: radioactivity
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