ACTIVITY, the Power of Acting, or the Active Faculty.See FACULTY, etc.

The activity of Fire exceeds all imagination. — The activity of an Acid, a Poison, etc. — Bodies, according to Sir Isaac Newton, derive their activity from the Principle of Attraction.

The Sphere of Activity of a Body is the space which surrounds it, so far as its efficacy or virtue extends to produce any sensible effect. See SPHERE, EXTENT, etc.