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at 56.4 °C (133 °F) at 1 atmosphere. The triple point is at 64.05 °C and 1.5 bar. Applying Graham's law gives:

:

where:
:Rate₁ is the rate of effusion of ²³⁵UF₆.
:Rate₂ is the rate of effusion of ²³⁸UF₆.
:M₁ is the molar mass of ²³⁵UF₆ = 235.043930 + 6 × 18.998403 = 349.034348 g·mol⁻¹
:M₂

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