What does act upon mean?

act upon meaning in General Dictionary

have and exert influence or impact

Sentence Examples with the word act upon

Now it is evident that the force in question, supposed to act upon the positive half only of the medium, produces just double of the effect that would be caused by the same force if the medium were undivided, and on the latter supposition (being also localized at a point) it comes under the head already considered.

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