- #1

LucasGB

- 181

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- The "4 pi" was added to the denominator so situations involving spheres could be simplified (both the formulas for the volume and the surface area of a sphere contain the term "4 pi" in the numerator)

But why was epsilon zero added to the constant? What does it simplify?

(You might find the answer here, I sure as hell didn't: http://en.wikipedia.org/wiki/Electric_constant#Rationalization_of_units)