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The size of a drop depends on the surface tension of the liquid (and gravity). A standard medicinal drop 50 microlitres.
you drop it when no one is looking
Drop one zero.
No, one drop is not necessarily equal to 1 ppm (parts per million). The concentration represented by 1 ppm refers to one part of a substance in one million parts of a solution, which depends on the total volume of the solution. The volume of a drop can vary based on its size and the liquid's properties, so the equivalence depends on the context and specific measurements involved.
Since one foot is 12 inches a four percent slope is .04X12 = 0.48 inch drop