Science Constants   Name Electric Constant Permittivity of Free Space     Symbol ε0     Value 8.854 187 817 × 10−12 F m−1     Category General Physical Constants     Comments Permittivity in a general medium is defined from D = ε0E + P where D is the electric flux density, E is the electric field strength, and P the polarization of the medium.The permittivity of free space is known exactly and defined from ε o = 1 μ o ⁢ c 2 . It appears in the expression for the force F between two electrostatic charges q1 and q2 a distance r apart, which is F = q 1 ⁢ q 2 4 ⁢ π ⁢ ε 0 ⁢ r 2 .     References The CRC Handbook of Chemistry and Physics , 81st edition, 2000-2001

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