is the molar mass of ²³⁸UF₆ = 238.050788 + 6 × 18.998403 = 352.041206 g·mol⁻¹

This explains the 0.4% difference in the average velocities of ²³⁵UF₆ molecules over that of ²³⁸UF₆ molecules.

UF₆ is a highly corrosive substance. It is an oxidant and a Lewis acid which is able to bind to fluoride,