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Grahams Law of Effusion & Diffusion Calculator

Compare relative rates of effusion and diffusion for two gases based on inverse square root of molar masses.

Input Parameters

Instant Real-time Calculation

Gas 1 Molar Mass (g/mol; e.g. He = 4.00)

Gas 2 Molar Mass (g/mol; e.g. N2 = 28.01)

Result Chemistry

Effusion Rate Ratio (Gas 1 vs Gas 2)

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Calculation Logic:

Grahams Law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molar mass.

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Understanding Grahams Law of Effusion & Diffusion Calculator & Formula

Mathematical Formula: Rate1 / Rate2 = √(Molar Mass 2 / Molar Mass 1)

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Effusion Rate Comparisons Relative to Air (M ≈ 29 g/mol)

Gas	Formula	Molar Mass (g/mol)	Relative Rate vs Air
Hydrogen	H2	2.016 g/mol	3.79 × faster than air
Helium	He	4.003 g/mol	2.69 × faster than air
Methane	CH4	16.04 g/mol	1.34 × faster than air
Carbon Dioxide	CO2	44.01 g/mol	0.81 × slower than air
Uranium Hexafluoride (U-235)	²³⁵UF6	349.0 g/mol	Used in isotope gaseous diffusion

How to Use the Grahams Law of Effusion & Diffusion Calculator

1 Input the molar mass of Gas 1.
2 Input the molar mass of Gas 2.
3 Obtain the relative effusion speed ratio.

FAQ & Help 1 question