Equation Icon  ∘ ------- 2 tS = --Ge---∼ 4.59 × 10−45 s, 4π 𝜀0c6 ∘ ------- --Ge2-- −36 ℓS = 4π 𝜀0c4 ∼ 1.37 × 10 m, ∘ ------- e2 mS = -------∼ 1.85 × 10−9 kg, 4π 𝜀0G