, the virtue or faculty of acting. As the activity of an acid, a poison, &c: the activity of fire exceeds all imagination.
According to Sir Isaac Newton, bodies derive their activity from the principle of attraction.
Sphere of Activity, is the space which surrounds a body, as far as its efficacy or virtue extends to produce any sensible effect. Thus we say, the sphere of activity of a loadstone, of an electric body, &c.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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