where ∆χ = χ s -χ w is the difference in the real part molar susceptibilities of the electrolyte and water and ∆ϕ V = ϕ V -ϕ w the difference in their apparent molar volumes. At room temperature, the dielectric constant of water ϵ w and its density ρ are approximately 80 and 1000 g/L. This yields χ w ≈ 1.4 so that ρ sol